I have a chance to get my hands on a blank lower gas
receiver,I want to do a C7A1 build up but I'm not sure
about the proper style of serial no. for the gun.
All C7's I was issued were just stamped C7 and a number,
I'm doing the flattop version with solid stock,I am assuming
this is a C7A1 and not the A2 according to the pictures
I have seen?
Any help would be appreciated