correct....norinco/bisley bolt 7.62x39mm and was using crappy old barnaul most impressed with terminal effect,in ham SMASHED femur and came to rest under skin at last rib on other side perfectly mushroomed.
insert was a bull barrel bought off this site..chambered and turned down to slide neatly inside my old single barrel .12ga,when I say neatly its a VERY snug fit so no movement at all,it wont go into any of my other .12ga barrels as they slightly tighter in bore diametre....
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