Hi,i would like to know why inside frame and cover got parts number,different than the one on barrel and cylinder,thank you
https://www.milsurps.com/images/impo...1ced84_k-1.jpg
https://www.milsurps.com/images/impo...55e1b2_k-1.jpg
https://www.milsurps.com/images/impo...c09807_k-1.jpg