I have noticed posts and am interested in swapping lowers and uppers in 75 series pistols. What is the proper protocol when doing so ? I am not changing caliber. If it fits it should shoot ? As long as the slide moves / cocks the hammer / chambers the round and ejects it all is good ? As an example , take an upper
( slide & barrel combo ) from a P-01 and install it on a PCR lower. Maybe if I have to ask I'm not qualified to do it ?