Cycling subsonic 223

Channel: ddn79


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100gr Extreme Shock 223 subsonic loads. With most normal subsonic 223 ammo, it will not cycle the action. If anyone know where I can get 100gr bullets that can be mag fed in a AR15, please let me know.

Rifle is a 16" LWRC Piston setup with a AAC M4-2000 suppressor. I believe the ammo should be subsonic in a 14.5" barrel, so might might be barely supersonic in a 16" barrel.