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I have also thought about cutting a few coils off the standard buffer spring to see if this helps. I need to find a reduced spring that I can try. I am leaning towards playing with the buffer spring and/or buffer. The idea of changing out the bolt carrier and gas block and such is not an option. So, my solution needs to be simple and easily available to all shooters. 22 Long Rifle ammo, has virtually no felt recoil, produces the same energy and power as most 380 ACP ammunition and delivers excellent accuracy out to 100 yards from rifles with barrel twist rates of 1 in 7’’ or faster. What are some options I can do to help aid the cycling? My goal is to have a subsonic round to sell to any and all shooters who have an AR-15 with 16" barrel and a 1:8" or 1:7" twist barrel shooting suppressed. Atomic Ammunition’s 223 Remington Subsonic is unlike any. When I get my speed up just above 1100 fps (supersonic speed), it will cycle and the bolt will lock back on an empty mag. It's the reversal of the old compressibility problem for P51s and P38s in a dive. The rifle bullets are designed for transonic flight, so when they hit sub-sonic velocities they become unstable. It will eject the spent case, but the bolt will not lock back on an empty magazine. The problem is when the bullet sheds the shock waves and the flow pattern switches, and the resulting buffeting. When I get down to the speed I need, I can not get the bolt carrier to fully cycle the next round. I have a working subsonic load with both bullets in a standard M4 type, 16" barrel shooting suppressed. As you can see, the Trail Boss powder is seriously huge. Bullets, casings, scale, sharpie, cotton balls, punch tool, Trail Boss powder. 223 ammo: Everything needed to create a subsonic 55 grain round that will deliver 128 ft/lb energy at 1000 FT/s. I am working with some custom 87 grain and 94 grain flat base, HP bullets that will stabilize in a 1:8" or 1:7" twist, 16" barrel. Here is a general step-by-step on making subsonic. I began working on my 223 subs that will cycle an AR. I need some help guys! I know ammo very well, but I don't know the inner workings of an AR as well, like some of you do.