Thanks guys - you answered my first question. I picked up a takeoff MKIII 22/45 barrel/receiver, and then got a MKII lower in parts from my gunsmith. When I try to put the barrel on the grip frame, the tang wont slide into the receiver lug. Now I know how to fix it...
However, once I do get it to fit, then how do you remove the loaded cartridge indicator, as I have a MKII bolt? It looks like the pin is pressed in but there is no way to press it out (at least not apparent to me). Thanks in advance, Tom