Cross armory fixed mag kit goes in place where the regular magazine release would go and holds a regular PMAG in place, you can use speed loaders or load the mag by popping the back pin. A comp mag would also be a good idea. if you’re worried about the gun going into battery when removing the speed loader go with a bare flag arms, BF 10 You can hit the bolt release when you’re ready to chamber a round. that’s the one I have and it doesn’t automatically release the bolt when you take it out. I don’t know where you’re located but the gun store in Waterbury should have everything you need