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Performance Report: The PSA Sabre Enhanced Mixtape Vol. 1 (8″ 300 Blackout)

Executive Summary

The Palmetto State Armory (PSA) Sabre Enhanced Mixtape Vol. 1 marks a major shift in the world of Personal Defense Weapons (PDW) and suppressor hosts1. In the past, if you wanted a compact .300 Blackout platform with high-end controls and optimized gas dynamics, you usually had to spend a fortune on boutique brands like Q or SIG Sauer, or spend months sourcing parts for a custom build3. The Sabre Mixtape changes that by offering a fully featured, “out-of-the-box” 8-inch pistol at a price point that makes professional-grade performance much more accessible1.

Designed for serious enthusiasts and home defense, the Mixtape Vol. 1 is built on PSA’s proprietary Sabre Enhanced receiver set2. It features an 8-inch stainless steel barrel with an aggressive 1:5 rifling twist and an adjustable gas block to keep everything running smoothly2. It arrives “suppressor-ready” with a factory-installed Plan B flash hider and a Maxim Defense CQB brace5. While we focused on the .300 Blackout version, the Mixtape line also covers newer calibers like .338 ARC, making it a versatile family of firearms8.

Overall, the community feedback is very positive, especially for those using it as a dedicated suppressed shooter4. By including premium parts like Radian handles, Sprinco springs, and Microbest chrome BCGs, PSA has avoided many of the quality issues that often plague budget builds2. However, it’s not a “plug-and-play” tool for everyone. The fast 1:5 twist is great for heavy subsonic rounds but can actually be dangerous with certain lightweight supersonic ammo10. There are also some proprietary design choices that make home maintenance a bit of a chore6. Ultimately, it’s a highly specialized tool that excels when used correctly.

Reliability and Accuracy

Mechanical Accuracy and the 1:5 Twist Rate Paradigm

The performance of the Mixtape Vol. 1 really comes down to its barrel: an 8-inch, bead-blasted stainless steel heart with a fast 1:5 twist rate7. Understanding how this twist rate affects your ammo is the key to getting the most out of this pistol.

The .300 Blackout is a “Jekyll and Hyde” caliber designed to shoot both light supersonic rounds and heavy subsonic rounds. Older barrels usually used a 1:7 or 1:8 twist to try and balance both11. But with very short barrels like this 8-inch version, bullets don’t have enough time to pick up speed. To make sure those heavy, slow subsonic rounds stabilize perfectly and expand on impact, manufacturers moved to the ultra-fast 1:5 twist10.

For subsonic shooters, this is a dream. The twist ensures the bullet spins fast enough to provide excellent accuracy and quick expansion at 50 to 100 yards6. Most users find they can consistently hit tight groups, making it a very reliable choice for suppressed hunting or defense6.

The Supersonic Limitation: Centrifugal Delamination

While the 1:5 twist is great for slow rounds, it creates a real safety risk with some fast ones. The physics are simple: if you spin a thin-jacketed bullet too fast, it can literally tear itself apart mid-air14.

Take the popular Hornady 110gr V-MAX, for example. Out of an 8-inch barrel, it can hit speeds over 2,100 FPS10. At those speeds, the 1:5 twist pushes the bullet to 300,000 RPM—the breaking point for many standard projectiles10. When this happens, the copper jacket strips off the lead core as soon as it leaves the muzzle10.

Projectile rotational velocity graph: 1:5 twist nears critical limits.

Since the Mixtape is built for suppressors5, this “jacket separation” can be a disaster. If pieces of copper fly off inside your suppressor, you’ll likely end up with a baffle strike that ruins your expensive gear and creates a shrapnel risk10. The takeaway: if you’re shooting supersonics, stick to solid copper or bonded rounds that can handle the spin, or just stick to subsonics entirely10.

Long-Term Reliability and Gas System Fluid Dynamics

The 8-inch barrel is actually the “sweet spot” for .300 Blackout, as the powder finishes burning just as the bullet leaves the muzzle11. PSA uses a pistol-length gas system to ensure there’s enough pressure to cycle the bolt every time2.

The tricky part is that subsonics and supersonics create very different pressure levels20. Adding a suppressor only complicates things. PSA solves this by including an adjustable gas block right from the factory, giving you the ability to fine-tune how much gas is used2.

While the Mixtape usually cycles subsonics perfectly out of the box6, you need to know how to adjust the gas. If you switch to suppressed supersonics without turning the gas down, the gun will kick too hard, wear out parts faster, and potentially cause malfunctions20.

The Maxim Defense brace also adds a unique variable. It uses a shorter buffer tube and a specialized H1 buffer system to keep the pistol compact5. Some users find that if they tune the gas for maximum silence, the lighter buffer might fail to lock the bolt back on the last round22. A little micro-adjusting or switching to a JP Silent Captured Spring usually fixes this right up22.

Malfunction Mapping and Verification

Malfunction TypeDescriptionPrimary Phase of OccurrenceVerified Causes & Mechanisms
Jacket Separation / Baffle StrikeProjectile disintegrates mid-flight due to rotational stress, destroying suppressor baffles.Firing / Mid-flight (Supersonic only)Centrifugal delamination caused by spinning thin-jacketed projectiles (e.g., 110gr V-MAX) past the 300,000 RPM threshold in a 1:5 twist barrel10.
Failure to Lock Back (FTLB)Bolt carrier fails to catch on the magazine follower after the final round in the magazine is fired.Empty Magazine / Cyclic PhaseSystem under-gassing when firing low-pressure subsonics, exacerbated by the stiff, proprietary Maxim CQB H1 buffer spring preventing full rearward carrier travel20.
Unintentional Double FireThe firearm discharges twice per single deliberate pull of the trigger mechanism.Firing / Reset PhaseTolerance stacking and user error associated with the extremely short mechanical reset of the Sabre 2-Stage DLC trigger, leading to unintentional bump-firing under recoil24.

Durability and Maintenance

One of the best things about the Sabre Mixtape is that PSA didn’t cut corners on the small stuff. They used high-quality parts from top-tier brands, which really pays off in long-term durability1.

The Bolt Carrier Group (BCG) is the hardest-working part of the gun, and PSA chose a full-chrome version from Microbest5. Chrome is great because it’s naturally slick and much easier to clean—an absolute must when you’re shooting with a suppressor, which tends to make everything dirty fast26.

The bolt is made from tough C158 steel and thoroughly tested to make sure it can handle the pressure of suppressed fire without breaking2, 27. They even used specialized screws (OCKS) and Sprinco springs to make sure the key components stay together and keep extracting reliably for thousands of rounds9.

The upper receiver is “thermal fit,” meaning the barrel is tightly unified with the receiver for better accuracy and a longer life2. It’s the kind of precision engineering you usually only find on very expensive custom rifles2.

Maintenance Constraints and Proprietary Architectures

Even though the parts are top-notch, working on this gun can be a bit of a headache for the DIY enthusiast.

For starters, removing the muzzle device isn’t easy. It’s secured with Rocksett, a heat-resistant ceramic adhesive5. You can’t just torque it off without risking damage to the barrel or receiver. The only way to do it safely is to boil the muzzle in water for about 20 minutes to dissolve the adhesive first2.

Then there’s the handguard. It requires a specific PSA tool to remove6. To make matters worse, the handguard actually blocks the dust cover pin. If you want to swap out your dust cover, you have to take the whole handguard off first—which means you better have that proprietary tool on hand6.

Original OEM PartRecommended SubstitutionReason for Intervention
Maxim Defense H1 Buffer SpringJP Silent Captured Spring (SCS) (Maxim CQB Specific)The standard coiled spring can induce cyclic inconsistencies and short-stroking with certain subsonic ammunition loads. The JP SCS eliminates acoustic spring “twang,” smooths the rearward recoil impulse, and allows for the precise micro-tuning of buffer weights to achieve consistent bolt lock-back22.
Sabre 2-Stage DLC TriggerGeissele SSA-E or LaRue MBT-2SWhile the proprietary Sabre trigger is generally praised for its smooth take-up at its price point, tolerance stacking can result in a fragile feel. The reset is exceptionally short, leading to risks of unintentional double-fires under the stress of rapid engagement1. Substituting for a duty-proven Geissele or LaRue ensures drop-safe, duty-grade reliability.
Sabre Plan B Flash Hider(User’s Suppressor Ecosystem Standard)If the operator does not utilize a Q/Plan B compatible suppressor (e.g., the Q Thunder Chicken or Trash Panda), the factory muzzle device must be boiled off and replaced with a KeyMo, ASR, or Xeno mount to interface with their existing National Firearms Act (NFA) ecosystem3.

Ownership Experience

Owning a Mixtape Vol. 1 feels a lot like owning a custom-built gun. The ergonomics are smart, and it arrives ready to go right out of the box.

Ergonomics and Operator Interface

The lower receiver is a step up from standard models. It’s fully ambidextrous, meaning both lefties and righties can easily release the magazine or catch the bolt2. This makes reloading and clearing jams much faster. It also has a flared magazine well to help you guide new mags in quickly, even when you’re under pressure5.

The controls feel premium, too. The Radian Talon safety is crisp and fast, and the Raptor charging handle is easy to grab even with a big optic in the way5. The B5 Systems grip is more vertical than older styles, which is much more comfortable for your wrist when you’re holding a short PDW close to your body5.

The star of the show is the Maxim Defense CQB brace. It lets the pistol collapse down to just under 21 inches, making it perfect for a bag or a truck19. You can deploy it instantly just by pulling it back. The only downside is that it doesn’t offer much of a cheek weld, and the metal arms can be a bit uncomfortable during long days at the range29.

Trigger Feel and Tolerance Stacking Risks

The Sabre trigger is smooth and clean thanks to its DLC coating7. Most users like the feel, but there are some concerns about how “fragile” it might be under heavy use24.

Because the reset is so short, it’s great for fast shooting, but you need good discipline. If your finger is a bit lazy, the recoil could cause you to accidentally “double-tap” the trigger24. For a defense gun, it’s something you definitely want to practice with or consider swapping out if you prefer a more traditional feel.

Warranty and Support

PSA stands behind the Mixtape with a full lifetime warranty that is one of the best in the business31.

Official Policy and Self-Defense Programs

This warranty is exceptionally simple: if something breaks due to a defect, PSA will fix it, period32. It’s also fully transferable, meaning you’re covered even if you’re the second or tenth owner31. They even pay for two-way shipping on verified claims31.

Naturally, it doesn’t cover normal wear, abuse, or improper modifications. If you use a third-party suppressor incorrectly and it causes a baffle strike, that’s on you33.

PSA also offers a partnership with “Right to Bear,” a membership program that provides legal protection for those involved in self-defense incidents34. It’s a nice extra for anyone using the Mixtape for home protection.

Factory Repair Turn-Around Realities

While some PSA lines have seen slower support, the Sabre series is known for being very responsive36.

Sabre owners usually report very fast turnaround times for repairs36. Many people have had their issues resolved in just over a week, which shows that PSA is serious about keeping their premium customers happy38.

Voice of the Customer (VoC)

The following synthesized statements represent the median consumer sentiment, rigorously filtered for statistical noise, brand-loyal “fanboy” praise, and isolated individual grievances. These sentiments are drawn directly from high-round-count users across verified technical forums (specifically Reddit’s r/300BLK, r/ar15, and primary retailer performance reviews):

“The Mixtape offers an unparalleled value proposition for a dedicated, specialized suppressor host. Sourcing a thermal fit upper, a Microbest chrome BCG, Radian ambi-controls, a Riflespeed/adjustable gas block, and a Maxim CQB brace independently would cost hundreds more in individual parts and shipping. However, the proprietary handguard attachment is immensely frustrating for home armorers trying to perform basic maintenance, like a simple dust-cover swap, without having to buy PSA’s specific wrench.”6.

“Out of the box, it cycles heavy 220gr subsonics effortlessly and quietly due to the adjustable gas block tuning. But buyers must be explicitly warned: the 1:5 twist is a highly specialized tool designed for copper expansion. Firing cheap 110gr V-MAX supers through this setup with a suppressor attached is playing Russian roulette with baffle strikes due to extreme centrifugal jacket separation. Stick to monolithics for supers or build a 1:7 if you want a general-purpose gun.”4.

“It perfectly scratches the ‘Honey Badger’ and ‘Rattler’ itch without the exorbitant boutique price tag or the proprietary piston systems. The ergonomics are fantastic, the B5 grip angle is perfect for the short length of pull, and the C158 bolt gives me peace of mind for hard use. Just be prepared to potentially swap the Maxim buffer spring to a JP SCS if you encounter lock-back issues with your specific brand of subsonic ammunition.”3.

Quantitative Ratings

Based on the synthesis of metallurgical data, mechanical design architecture, empirical user reports, and comparative market analysis against peer platforms, the PSA Sabre Enhanced Mixtape Vol. 1 scores as follows (on a 1-10 scale):

CategoryScoreJustification
Reliability8.5The integration of the Microbest BCG and adjustable gas block ensures excellent cyclic function, though the proprietary Maxim buffer occasionally requires tuning for specific subsonics, and the 1:5 twist severely restricts safe ammunition choices2.
Accuracy9.0The aggressive 1:5 twist rate and thermal-fit upper receiver provide exceptional stabilization and consistent sub-MOA potential for heavy subsonic projectiles2.
Durability9.0Premium materials (C158 bolt, Sprinco springs, OCKS fasteners, 416R barrel, DLC coatings) rival boutique platforms costing over twice as much26.
Maintenance6.5The platform is severely hampered by the proprietary barrel nut/handguard tool requirement, the blocked dust cover pin, and the tedious necessity of boiling the Rocksett muzzle device for removal6.
Warranty/Support8.0The 100% lifetime, fully transferable warranty is industry-leading on paper; while some PSA product lines experience service delays, Sabre-specific support is reported to be highly responsive31.
Ergonomics9.0The fully ambidextrous lower receiver, integrated Radian controls, steep B5 grip angle, and the highly compact Maxim CQB brace offer a top-tier operator interface5.
OVERALL SCORE8.3An exceptional, highly specialized PDW offering unmatched value, provided the operator respects its maintenance quirks and strict internal ballistic limitations.
Sabre Mixtape Vol. 1 performance scorecard with overall score of 8.3/10 and category breakdown.

Pricing and Availability

Manufacturer’s Official Website: Palmetto State Armory (PSA)

Average Street Price: Based on current retail data, the determined average street price for the fully assembled PSA Sabre Enhanced Mixtape Vol. 1 8″ 300 Blackout is $1,224.991. (Prices typically fluctuate directly between $1,199.99 for the standard black anodized variant and $1,249.99 for the specialized Cerakote variants).

Vendor Search Results:

Analytical Approach

This exhaustive analysis was conducted utilizing a strict, multi-tiered data aggregation and filtering framework designed to ensure absolute objectivity and technical accuracy. The primary data-gathering process relied on aggregating raw technical data from manufacturer specifications, verifiable vendor pricing databases, and highly technical, high-traffic firearms communities—specifically Reddit’s r/300BLK and r/ar15, alongside dedicated platform-specific forums10. To analyze the complexities of internal ballistics and rotational forces, standard physics algorithms (RPM calculation formulas) were applied and subsequently cross-referenced with empirical failure reports published by major ammunition manufacturers (e.g., Hornady, Sierra)11.

The core of this methodology relies heavily on isolating verified, multi-platform defect trends from isolated anecdotal anomalies—a process known as signal versus noise filtering. For example, a single user reporting a failure to extract was discarded as noise; however, a patterned cluster of users utilizing subsonic ammunition, short-stroke PDW braces, and specific buffer weights reporting identical cyclic failures was elevated to a “verified trend.” Similarly, emotional “fanboy” praise regarding aesthetics or brand loyalty was entirely stripped from the analysis, focusing the report purely on quantifiable metrics such as material science (C158 steel vs. 9310), manufacturing tolerances (thermal fit upper geometry), and ergonomic biomechanics2.

Data Constraints

  • Source Integrity: The conclusions drawn in this report are strictly based on technical documentation and aggregated accounts from high-round-count users who possess demonstrable technical literacy regarding AR-15 gas system tuning and platform architecture.
  • Verification Protocols: Claims regarding defect trends—such as the proprietary tool constraints and the 1:5 twist jacket separation risk—are supported by multiple, independent accounts and verifiable mathematical physics6. Unverified, single-source anecdotes (e.g., isolated complaints of a specific blemished finish without corroborating photographic evidence or secondary reports) were excluded from the primary reliability analysis to maintain analytical rigor.

Note: Vendor Sources listed are not an endorsement of any given vendor. It is our software reporting a product page given the direction to list products that are between the minimum and average sales price when last scanned.

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Sources Used

  1. Mixtape | AR | Sabre – Palmetto State Armory, https://palmettostatearmory.com/sabre/ar/mixtape.html
  2. PSA Sabre Enhanced Mixtape Vol. 1 8″ 300 Blackout 1:5 Pistol w/ Sabre Plan B Mount & Maxim CQB Brace | Sigwo Arms, https://www.sigwoarms.com/shop/51655227618-psa-sabre-enhanced-mixtape-vol-1-8-300-blackout-1-5-pistol-w-sabre-plan-b-mount-maxim-cqb-brace-2281
  3. Introducing the PSA Mixtape! – Page 8 – AR-15 – Palmetto State Armory | Forum, https://palmettostatearmory.com/forum/t/introducing-the-psa-mixtape/39527?page=8
  4. Is the psa Sabre mixtape good for a 1st 300blk? – Reddit, https://www.reddit.com/r/300BLK/comments/1ormq47/is_the_psa_sabre_mixtape_good_for_a_1st_300blk/
  5. PSA Sabre Enhanced Mixtape Vol. 1, The Black Album – 8″ 300BLK 1:5 Pistol w/ Sabre Plan B Mount & Maxim CQB Brace, Black – Gallenson’s Guns, https://gallensons.com/product/psa-sabre-enhanced-mixtape-vol-1-the-black-album-8-300blk-15-pistol-w-sabre-plan-b-mount-maxim-cqb-brace-black/
  6. PSA Sabre Enhanced Mixtape Vol. 1 8″ 300 Blackout 1:5 Pistol w/ Sabre Plan B Mount & Maxim CQB Brace | Palmetto State Armory, https://palmettostatearmory.com/psa-sabre-enhanced-mixtape-vol-1-8-300-blackout-1-5-pistol-w-sabre-plan-b-mount-maxim-cqb-brace.html
  7. PSA Sabre Enhanced Mixtape Vol. 1, The Black Album – 8″ 300BLK 1:5 Pistol w/ Sabre Plan B Mount & Maxim CQB Brace, Black, https://palmettostatearmory.com/psa-sabre-enhanced-mixtape-vol-1-8-300blk-1-5-pistol-w-sabre-plan-b-mount-maxim-cqb-brace-black.html
  8. What Should I Buy Wednesday 01/29/25 : r/guns – Reddit, https://www.reddit.com/r/guns/comments/1icm98k/what_should_i_buy_wednesday_012925/
  9. Best Deal on PSA Sabre Enhanced Mixtape Vol. 1 8″ 300 Blackout w/ Plan B Mount & Maxim CQB Brace – $1249.99, https://www.pewpewtactical.com/deal/293/
  10. Is 1:5 twist too much for SuperSonics in a 9” barrel? : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1owb9br/is_15_twist_too_much_for_supersonics_in_a_9_barrel/
  11. 1:5 twist 9in has anyone actually over spun a supersonic? : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1mpijdb/15_twist_9in_has_anyone_actually_over_spun_a/
  12. PSA Sabre Enhanced Mixtape Vol. 1 8″ 300 Blackout 1:5 Pistol w/ Sabre Plan B Mount & Maxim CQB Brace – Gallenson’s Guns, https://gallensons.com/product/psa-sabre-enhanced-mixtape-vol-1-8-300-blackout-15-pistol-w-sabre-plan-b-mount-maxim-cqb-brace/
  13. Same old twist rate questions : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1oo7vyv/same_old_twist_rate_questions/
  14. 7.5” 1:5t with supers. : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1ekuscv/75_15t_with_supers/
  15. Reloading Supersonic: What bullets for 7.5″ 1:5 barrel? : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1mgijte/reloading_supersonic_what_bullets_for_75_15_barrel/
  16. 1:5 Twist Supersonic Jacket Separation, myth or real (NOT THEORETICAL) – Reddit, https://www.reddit.com/r/300BLK/comments/1qohfvg/15_twist_supersonic_jacket_separation_myth_or/
  17. First 300 Blk Build, What to get : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1o34evk/first_300_blk_build_what_to_get/
  18. 1:5, RPM, jacket separation w/ TMJ : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1jf2qw8/15_rpm_jacket_separation_w_tmj/
  19. DANIEL DEFENSE DDM4 PDW (.300 BLK) WITH MAXIM DEFENSE CQB PISTOL BRACE (BLACK) | Modern Warriors, https://modernwarriors.com/product/daniel-defense-ddm4-pdw-300-blk-with-maxim-defense-cqb-pistol-brace
  20. Advice Needed For Superlative Arms Venting Adjustable Gas Block : r/300BLK – Reddit, https://www.reddit.com/r/300BLK/comments/1he8fj8/advice_needed_for_superlative_arms_venting/
  21. Which Plunger Size is Right for My Carbine? – RIFLESPEED.COM, https://www.riflespeed.com/Which-Plunger-Size-is-Right-for-My-Carbine_b_6.html
  22. 300 BLK Subsonic Suppressed – Bolt Not Locking Back & Occasional FTF – Reddit, https://www.reddit.com/r/300BLK/comments/1iwff8o/300_blk_subsonic_suppressed_bolt_not_locking_back/
  23. SanTan Tactical .300BLK Pistol W/ Maxim Defense Pistol Brace Overview : r/guns – Reddit, https://www.reddit.com/r/guns/comments/63epqn/santan_tactical_300blk_pistol_w_maxim_defense/
  24. B-GC BROWNELLS/GEISSELE COMPETITION 1-STAGE TRIGGER FOR AR-15 Reviews & Ratings, https://www.brownells.com/product-reviews/?product=ar-15-enhanced-triggers
  25. Top 13 AR-15 Rifles: A Comprehensive Hands-On Review – ProArmory, https://proarmory.com/blog/top-13-ar15-rifles-a-comprehensive-handson-review/
  26. Microbest Rainbow PVD Chrome Bolt Carrier Group | AR-15 – Mid State Firearms, https://midstatefirearms.com/product/microbest-m16-oilslick-pvd-chrome-bolt-carrier-group-mpi-hpt-ocks-sprinco-c158/
  27. Microbest Premium Grade M16 Bolt Carrier Group BCG – Nickel Boron, https://charliescustomclones.com/microbest-premium-grade-m16-bolt-carrier-group-bcg-nickel-boron/
  28. First Bolt Bust : r/ar15 – Reddit, https://www.reddit.com/r/ar15/comments/1jwidjy/first_bolt_bust/
  29. PSA MIXTAPE – Sabre 300 Blackout – YouTube, https://www.youtube.com/watch?v=9ZObBKxcU7k
  30. Best Truck Gun 2026: Braced AR Pistols, PCCs & Shotguns, https://www.rifleconfigurator.com/guides/best-truck-gun
  31. About Palmetto State Armory, https://palmettostatearmory.com/about-psa.html
  32. PSA AK-102 Side Folding Pistol Classic w/ Triangle Brace and Toolcraft Trunnion, Bolt, and Carrier | Palmetto State Armory, https://palmettostatearmory.com/psa-ak-102-side-folding-pistol-classic-w-triangle-brace-and-toolcraft-trunnion-bolt-and-carrier.html
  33. Warranty Policy | Palmetto State Armory, https://palmettostatearmory.com/help-center/warranty-policy.html
  34. RIGHT TO BEAR Self-Defense Coverage – Palmetto State Armory, https://palmettostatearmory.com/right-to-bear
  35. Right To Bear Joins Amicus Brief Defending Gun Owners From, https://protectwithbear.com/blog/amicus-brief-adamiak-vs-united-states
  36. PSA Warranty : r/PalmettoStateArms – Reddit, https://www.reddit.com/r/PalmettoStateArms/comments/16pfql1/psa_warranty/
  37. Bought a PSA Dagger – Constant FTEs, Warranty Refuses Refund. Just Looking for Advice from the Community. – Reddit, https://www.reddit.com/r/PalmettoStateArms/comments/1l461i3/bought_a_psa_dagger_constant_ftes_warranty/
  38. PSA strikes again. My friend’s brand new PSA upper failed to feed repeatedly and I asked for a feed ramp pic. – Reddit, https://www.reddit.com/r/ar15/comments/fwbgos/psa_strikes_again_my_friends_brand_new_psa_upper/
  39. Is building a Mixtape cheaper than buying one? : r/PalmettoStateArms – Reddit, https://www.reddit.com/r/PalmettoStateArms/comments/1tmfop1/is_building_a_mixtape_cheaper_than_buying_one/
  40. PSA Mixtape Vol 1 : r/MDGuns – Reddit, https://www.reddit.com/r/MDGuns/comments/1of7njv/psa_mixtape_vol_1/
  41. FSB canted slightly, warranty claim? : r/ar15 – Reddit, https://www.reddit.com/r/ar15/comments/16jekus/fsb_canted_slightly_warranty_claim/