I’m a fan of the Roller Delayed Blow Back firearms for a while and have had opportunities to own and shoot ones from HK, POF, and PTR. I knew the rollers were locking the bolt head in place but never really understood the details of the action. I’ve tracked down two great videos to help show you what is going on.
This is a PTR PDWR in .308 – basically a cut down HK-91 style pistol with a SB Tactical SOB Brace and a Vortex Optic.
Forgotten Weapons
In this short video, Ian @ Forgotten Weapons does a great job explaining just how this system works.
MouseGunner
This is one of MouseGunner’s cool x-ray renderings where he shows the MP5’s action at work. He’s done this for other weapons as well and watching the weapon operate really helps.
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When the ATF reversed the ruling about braces and enabled folks to use them however they saw fit, the demand and supply of pistol braces went into orbit. I have carpal tunnel and a hereditary tremor so for me, using a brace is the only way I can wield a heavy pistol – such as one based on an AR, AK or MP5 type of action.
PSA has come a long way. I’ve used them as my go-to AR parts supplier for years and now they have great deals on parts, kits, receivers, and firearms. They also offer some great deals on braces – by themselves as parts, as part of a kit offering or even on firearms.
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Both of these rifles were finished using Duracoat’s spray on finish. You really needed to blast the surface, make sure it was very clean and then allow the finish to cure for a week for it to be durable.Baking on Molyresin over manganese park. That’s a M92 with a long barrel in the front and a M72B1 in the rear from back in the days when I had free time 🙂
These days, I do a base surface preparation of manganese parkerization and then Norell’s Molyresin on top. The park creates an ideal surface for any sprayed on finish like Alumahyde, GunKote or Molyresin to stick.
The following are some great examples of products they carry:
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Let me open with telling you that I am providing the following information for educational purposes only. I find chemistry fascinating as you can tell by my various posts on parkerizing, acid etching (with apple cider vinegar and with ferric chloride), epoxies and more. So, I’ve seen various posts over the years about making your own black powder and usually filed them away for future reference. What changed was that Youtube actually recommended a video on making black powder and then that led to another and another. I took the three videos I liked the most and decided to share them.
Please, if you try anything, do so safely. Research first, pick safe location and be careful. You accept all liability – I am providing these resources for reference purposes only!!
Starting Basic: The King of Random
The back story is that this guy loved experimenting and posted his projects on YouTube. The genuine tragedy is that he recently passed away in a paragliding accident. This is a very interesting video and sets the stage for do-it-yourself black powder.
The three ingredients from left to right: Sulfur from plant fungicide.home made charcoal and potassium nitrate from stump remover.
In this post, the presenter shows you how to make a basic unrefined black powder with charcoal and then powdered potassium nitrate from stump remover and powdered sulfur from plant fungicide. Note, these are all available at your local hardware store – you need powders and not liquids by the way. It’s a basic process and creates a “green” or unrefined black powder.
A More Refined Approach From the Science Pirate
This fellow is a chemist and really good at explaining what is going on and how to do it. He shows how he goes about processing the 75% Potassium Nitrate, 15% charcoal and 10% sulfur into black powder.
Here he’s screening the charcoal. Instead of expedient materials, he is using lab grade chemicals and supplies as you can see.
The Best Video: GhoolerHunter Covers An Old Military Method
He’s getting ready to strain his solution.
This fellow really goes into detail behind a process for producing a more refined black powder. He does point out to beware of static electricity if you are using metal trays like he is.
Some Charcoals Are Better Than Others
Interesting enough, having the right charcoal is really important. Some woods are way better than others and I think you’ll find that you will either need to make your own charcoal or will need to do some hunting to find very specific charcoal for good results.
For example, woods to use include certain species of Alder, Balsa, Buckthorn (both alder and carolina), Cottonwood (narrow leaf), Dogwood (cornus florida), Maple, Paulownia, Plum (prunus domestica), and Willow (Black, white, weeping and pacific but not Rocky mountain). To learn more, please see:
Again, this is all provided for reference purposes only. If you decide to try anything, please research first and put safety before everything else. Also, be sure to comply with all laws and regulations that apply to you.
Sorry to sound like a lawyer but these days, it needs to be said. I hope the info helps you out.
Please note that all images were extracted from the video and are the property of their respective owner.
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In the previous video, Ian at Forgotten Weapons does his bench top review. In this one, we get to see the rifle perform at the range. Ian was at 100 yards and he’s firing PPU match 182 gr 7.62x54r ammo and the group opened up as the barrel warmed up.
Group one – relatively cool barrelGroup 2 opened up a lot – Ian did not the barrel was hotGroup 3 – disappointing. Ian wonders if the scope had problems.
The Range Video
My Conclusion
It really does come across as a Serb copy of the PSL and not worth the fortune it is selling for unless you are a true collector. Whether it was the rifle or the scope, the results are not impressive. Personally, I thought about buying one and decided to pass. when they first came out and this cements it.
Please note that all images were extracted from the video and are the property of their respective owner.
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Ian, over at Forgotten Weapons, did a review of the new Zastava M91. In the end, you do wind up with a over-sized 7.62x54r AK variant filling a designated marksman role (DMR). As always, Ian does a provides a great commentary as he looks at and then disassembles the M91.
Stamped receiver with a unique extension at the rear to accommodate the longer cartridge. Note the POSP 4×24 optic.The M91’s unique handguardSkeleton stockA quick look down in the receiver – you can see the extension is riveted in place.
Please note that all images were extracted from the video and are the property of their respective owner.
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I can’t stand Biden and think this is absolutely hilarious – The” Angry Joe-14″ AR-14 Stripped Lower. LMAO!! Complete with a dog face pony soldier logo!
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Paul sent me in a photo of his custom M72 carbine with our handguards. It sure turned out cool. Here’s the info he shared about it:
M72 Unissued mint kit
AK Builder 16″ barrel
POSP 4×24 scope on AKM rail
4.5mm rear folder
JMac customs RRD 4C brake
Built by Mod Outfitters
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