Posted By: ChadTRG42
223 subsonic that cycles an AR- AR helped needed - 01/29/15 05:49 PM
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. I began working on my 223 subs that will cycle an AR. 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. I have a working subsonic load with both bullets in a standard M4 type, 16" barrel shooting suppressed. My problem is this. When I get down to the speed I need, I can not get the bolt carrier to fully cycle the next round. It will eject the spent case, but the bolt will not lock back on an empty magazine. 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. So, I am almost there. 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. So, my solution needs to be simple and easily available to all shooters. The idea of changing out the bolt carrier and gas block and such is not an option. I am leaning towards playing with the buffer spring and/or buffer. I need to find a reduced spring that I can try. I have also thought about cutting a few coils off the standard buffer spring to see if this helps. Any ideas?