I bought a new 1100 reciever from numrich through gunbroker. It was advertised as a 12 ga. I had some parts left over from other projects for a 12 ga. 1100. Had to buy some things I didn't have, but now that I have everthing I realize my ejection port and magazine tube are too small for a 12ga. shell! After talking to remington and running serial # I now Know i have one of the older standard frame 20 ga. recievers. My question is, can I changr to 16ga. or 20ga. by simply getting the proper barrel, intercepter latch, feed latch, and proper bolt? Has anyone got these parts for sale? I know that barrels are really hard to come by, but numrich seems to have other parts except for a bolt, which is very exspensive! I need some help..Rob