![]() ![]() I moved the target to 150 yards and fired three rounds, which hit 26.5 inches low. Next I moved to 100 yards, where the 220-grain Black Hills hit 6.2 inches low-not surprising with a heavy bullet travelling at 1,050 fps. I also shot three groups with Gemtech 187-grain polymer tip subsonic, which shot. This combination shot really well, with three, three-shot groups averaging. 300 Whisper and rezeroed at 50 yards suppressed. I then loaded a couple of magazines with Black Hills 220-grain. That 300-yard group is center-of-man or deer, but I don’t know how much energy it has. The BDC feature worked well, but even with good ammo, it’s not exceptionally accurate-.8 inch at 100, 2.5 inches at 200, and about 5.5 at 300. I zeroed at 50 yards with Winchester 150-grain XP soft points, then used the BDC reticle to shoot at 100, 200, and 300 yards. I first shot the rifle unsuppressed to see how it and the scope did. 30-30 Winchester-not a 500-yard sniper round, but fairly effective within its range. If I recall correctly, Russian military doctrine is massed rifle fire within 200 yards: Get enough troops within 200 yards, shoot a bazillion rounds, and someone is gonna die. In supersonic loadings, 300 blackout ammo is about on par with 7.62×39, the AK/SKS round. The Colt 5.56 upper is also equipped with the Gemtech suppressor bolt group-a 90-degree rotation of one screw changes it from unsuppressed to suppressed, and the QD Gemtech mounts are the same on both guns, so it can also be fired suppressed with 5.56. Birdsong camo finish is aesthetically pleasing and durable. I took off the 5.56 upper from my Colt 6920 and replaced it with the. I have a Gemtech One suppressor, so I bought a QD mount and was set. The scope has stadia lines for ranges out to 500 yards. This AR has some additions: a Giselle SSA trigger, BCM charging handle, and enhanced trigger guard. I’ve used Birdsong’s Black-T on many of my guns for 25 years and think it’s the best finish available-better lubricity than oil and great corrosion resistance. I sent the upper to Birdsong for a Black-T camo job that matched the existing lower on a Colt 6920. I was able to assemble a pretty decent upper and mounted a. I had some parts and a stripped BCM upper and got a barrel from Brownells and a forend from Diamondback. I decided to put one together to see how it performed suppressed. 300 AAC Blackout (.300 BLK) that give the history and purpose of the cartridge. 300 upper, Leupold scope, and Gemtech One suppressor.Īrticles have been written on the. All in all its a great concept especially to keep noise down or low recoil for children to have fun at the range.Colt with. My understanding this over gasses the weapon. 0 baffle strikes but im very curious as to why it key holes.but Im more curious about running the GI Spring and Buffer for any longevity or parts failure. I swapped back the HK buffer and spring along with some Federal XM855s and accuracy picked up a great deal along with the noise. ![]() My target was set up about 50 yards away and at a standing position, and fairly quick rate of fire. I never expected a 10inch gun with subs to be accurate but did find it interesting with the bullet tumbling. Took a step back into the garage and swapped out the HK buffer/spring for a standard GI buffer and spring, I assume H2 buffer. First magazine was unsuccessful at ejecting the empty cartridge. Everything else pretty much standard the factory HK parts. I was interested in some subsonic 556 for my 416 UBL raid gun clone after having a new born and loving to shoot at all hours of the day. Range Report with Atomic Ammunition Cycling Subsonic 556. ![]()
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