this is a file for a GEN 4 style frame that uses gen 3 internals and PSA front and rear rails. There are two versions included, one has a grip that's extended by a few mm to fill the gap between the mag plate and frame. this version works with OEM glock 19 mags but not with some aftermarket mags so i included a shorter version for those. if you don't want to serialize your frame, print the "no tag plug" and insert it into slot and weld it shut with a hot knife or soldering iron. If you wish to serialize your frame print a USGI dog tag with 6x 7-digit numbers on it, evenly spread out and cut it between numbers to make 6 tags.