will a chinese 16inch ak barrel fit a Milled bulgarian slr-95 receiver? tapco has them for .....$100? it be nice to have a spare. will steel core ammo cause the barrel to wear faster? if so, why? since the bullet is copper jacket with a steel core. i got some chinese ammo for the AK and FN FAL. i am afraid to use it fearing it will damage my barrel. all info appreciated, thanks.