your most likely not going to find semi parts at gun shows. Just full auto parts and parts kits. Your best and cheapest way of going about a build Is to buy a complete parts kit which will be less the right side plate. The only parts you need for semi auto is a semi auto trigger, sear, and return spring. Karma metal products has them and allied armament. (I suggest karma) and also a semi right plate. Your lockframe, barrel extension, and bolt need to be machined for semi auto. On this site if you look up 30calmachinegunner he has the best deal in town doing the machine work on these 3 pieces and can supply the karma trigger, sear, and return spring. He does what I think is the best quality work and has quick turnaround time. The right plates are sold in 100% complete and 80% complete. I prefer the 80% as I trust only myself for drilling the holes. There are quite a few people who sell the plates. As IDing the parts I dont know the exact measurements but I know that the right semi plate Is thicker than a full auto plate. and the 3 internal parts are machined thinner to compensate for the thicker plate. Im sure someone can chime in and give you exact measurements, but like I said you usually need to get these parts done rather than them lying around on the tables of gun shows. good luck.
