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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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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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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I recently posted a video that shows the amazing paint job the Czechs did to one of their Mi-35 Hind-D attack helicopters. Little did I know that there was a “behind the scenes” short documentary about the decision making that went into that paint job and that they won an award for it.
They had a number of conventional ideas that didn’t really wow anybody until they thought of a guy who specialized in the bio-mechanical look.They do have some footage of the fellow doing the work. It was he, his brother and a few technicians who spent about 200 hours doing the paint job. I wish they had more footage of it and at a higher resolution.
The Documentary Video
Again, if you haven’t seen it already, check out the other post with a ton of footage of this awesome Hind. I hope you enjoyed these!
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Back in 1987, a damaged Libyan Mi-25 Hind D attack helicopter was captured by French and Chadian troops. The US wanted to inspect the helicopter and negotiated with the government of Chad to retrieve it.
Libyan MI-24 Hind D captured by Chadian forces at Wadi Doum, Chad . Source: Wikipedia
On June 10, 1988, Operation Mount Hope III commenced to retrieve the Hind. The famous NightStakers (the 160th Special Operations Regiment) flew almost 500 miles at night with two MH-47 Chinooks to successfully retrieve the Hind and load it on a C-5.
On 21 June 1988, the captured Mi-25 arrived in N’Djamena where it was loaded into a USAF C-5 Source: Wikipedia
Videos
There are a couple of cool videos on Youtube that can give you some good background. The first one is very informative but please note the Hind D is not the fastest helicopter currently.
The next video has the same cover photo but is different:
Please note that the still photos are from the Wikipedia page listed above.
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I now have built my second Beowulf and guys ask me about the recoil all the time – the short answer is that it’s very manageable. With just a bit of tuning, I’d put it somewhere between a 20 and a 12 gauge shotgun shooting 2-3/4″ magnum loads. Now that there are a ton of options both from Alexander Arms as well as generic 12.7×42 uppers (the metric designation for the Beowulf so they don’t have to pay royalties to Alexander Arms), a lot of guys are getting into the .50 Beowulf cartridge and ask me about what brake to run with.
My favorite is the Timber Creek Heartbreaker. It does a remarkable job of venting gasses backwards to compensate for the recoil it would otherwise have. I liked it so much on my first build that it was what I used in my second build. It’s very affordable and I’d be surprised if you can find a brake that does a better job!
Side view of the Heartbreaker and you can see where it gets its name.
View from the top. Note the brake includes a jam nut.
Finding The Brake
You may need to go direct to Timber Creek. Primary Arms is out of stock and they are sometimes on eBay.
My Alpha Wulf
I did a series of blog posts when I built my second rifle. My pet name for it was the “Alpha Wulf” or the leader of the pack. It’s all premium parts and probably my best AR build when it comes to paying careful attention to details during assembly. Here are the posts:
I’m a big fan of the .50 Beowulf cartridge and hope you find this post helpful!
3/6/24 Update: I’m not sure if Timber Creek is still making these or just what. I haven’t built a Beowulf for a few years and don’t have any alternative suggestions.
Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.
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