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You can find some direction on the changes on the web if you're really interested in perusing it.ģ00BO is a much easier option for an AR system that cycles subs. It's just not that practical, so most don't mess with it. You're also shooting a round that has significantly neutered ballistics. Re the OP's question, it's possible to make an AR cycle subs, but by the time you increase the port diameter, shorten the gas system, and tune the buffer, you'll end up with a dedicated upper/rifle. Much harder hitting and will penetrate about any living target stem to stern. With a 300 your shooting a 200 grain or heavier bullet at 1100 fps. Please check out and support the people who help make.more. Even if you do get your 556 to run subsonic like kerplode eluded to your power level is not much more then a 22lr. 2,839,371 views Shooting subsonic 223 basics. For what your going to invest in time and loading components and gas to run to the range just pick up a 300 bo upper and then its a pretty easy goal. Solvent trap? Still isn't going to keep you from breaking the sound barrier and that's what will account for most of the noise when your running suppressed in a 556. Unsuppressed, it is as quiet as most 22 LR and has minimal felt recoil. Its not even worth trying unless you want to run your gun manualy. Atomics Tactical Cycling Subsonic is unlike traditional high powered rifle ammunition. He failed to clean all the cutting fluid out of the can during assembly so when I fired the gun during the demonstration the suppressor spewed large volumes of smoke….go figure.Correct answer. On a side note: a friend of mine who manufacturers suppressor gave me a can that he had just completed with a new baffle design for this demo. 223 Remington rounds, this is most often accomplished by increasing the bullet weight from the traditional 55 grain (gr) to a heavier 77 gr. It was during that time we recorded this demonstration video. 223 ammo features bullets that travel at speeds slower than 1,126 feet per second, keeping the velocity below the speed of sound. I spent several years running around the country demonstrating the ammo to numerous state and federal agencies but it was never considered anything more than a novelty at the time. I was half way there.Įventually I found a couple bullet manufacturers who made 100 grain jacketed lead core projectiles for me, at a cost of fifty cents a piece, that worked quite well.
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Every bullet went sideways through the plate but the gun cycled flawlessly and even locked the bolt back on the last round.
SUBSONIC 223 ROUNDS FULL
With some small degree of confidence I loaded a magazine full of my new creation, put a suppressor on an M-16 with a 14 1/2” barrel and a 1-in-7 twist, fired a few rounds semi-auto then went full-auto into a thin metal plate at 25 yards.
SUBSONIC 223 ROUNDS TRIAL
After some trial and error using numerous powders I came up with a load that gave fairly consistent velocities of 1,000-ish feet per second. I think there is way too much difference in powder burn rates/case volume/pressures. So, yeah, I'd say it's possible if you wanted a dedicated subsonic rifle. Not only was the projectile really ugly but it was slightly banana shape. Seems like you dont gain much over a 22LR, but about 30 grains of bullet weight. 224 size die, and made my own 140 grain bullet. So I applied a little redneck-tech and soldered together two of the 70 grain projectiles, base to base, ran them through a. While I had developed a 5.56 load that was accurate and displayed consistent shot to shot velocities, it wouldn’t even budge the bolt of an M-16 rifle. The heaviest projectile I had at the time that would stabilize at subsonic velocities was a Speer 70 grain semi-spitzer. I understood the premise that a heavy-for-caliber bullet was needed but nothing off the shelf was readily available. Back in the late 90’s, subsonic 5.56/223 ammo that would reliably cycle an unmodified M-16 or AR-15 was only a mythical beast, at least in the circles that I ran in.