This thread is a little older but I have some questions. I have a .308 bolt gun, a 16" carbine .223, and a 7.5" .223 ar pistol thats is an adams arms upper (piston gun). Obviously a one can solution would have to be a .308 bore. But does any company offer a .308 can that is warrantied for use on a 7.5" .223? I also think I would like it to attach to a MD so I can use them as a sacrificial baffel. Note: this would be my first can and none of the listed weapons are full auto, and the .223 only see rapid semi auto fire during occasional classes and usually only in 3-5 shot strings. Not mag dumps. I do however have .22 conversions for the .223 ar setups. Any help in the right direction is appreciated.