would a .223 can work on a 5.45 rifle? more specifically an ak74?
I know shooter521 has mounted is Gemtech HALO on his AK-74 and it has worked well.
he also blew the end out of it while mounted on his AK105.
He's not the only one Ive seen either, but I think it has to do more with a loss of concentricity due to the FSB and adapter together being off. Basically the error multiplies, barrel error + fsb error + adapter error = ouch