This is funny.think of the type of fire arm or mdl as the receiver . it dosen't matter what you do to it if it has a 1891 receiver that is what it is. you have to read ALL the C&R rules to get the real truth of it.If you put a remington 700 barrel on a pre 64 mdl 70 winchester what mdl is it?YES it is still a pre 64 mdl 70 so stop arguing over that point it is clearly stated in the C&R regs that modifying a military rifle does not change it Status . unless you change it from a semi auto to full auto.