No, subs will not cycle an AR in .223. You can get an AR with standard parts to choke on light factory loads, to cycle subs would require a dedicated upper with an enlarged gas port, light buffer, light weight BCG, or a combination of those. Even if you could make it work, it wouldn't work with standard loads. If you want to shoot subs, the 300BO is the answer. Although, even then you still don't have a quiet gun.
Last edited by wareagle700; 04/13/15.
