Re: .22LR conversion upper for SA TRP Operator
you should be able to use just about any conversion kit out there, the kits replace the entire top end, slide and all.
Advantage Arms makes one, Kimber makes one, Marvel makes one. Unfortunately they are only 10 round magazines although I think that caliber conversions is making a high cap mag for the Glock series of conversions and I am sure if they go over well they will look into doing one for a 1911. I would suggest that if you are going to use it for training purposes then run 7 rounds in a mag like you would and also get the AA kit because it has last round slide stop where the Kimber kit does not, and I dont know about the Marvel.