First off i have a 9mm rra carbine with new integrated magwell. CP products says for rra move block down .010 , i cant its fixed. My question is ,do i need rra mags $,c-mags$$$$$$$$$$$$$$$$$$$$,or make my own off the mag that came with rifle out of uzi mags? I got 4 prom ags already that work , really dont want more plastic, got them 10 bucks a piece . Took chance for that kind of money.Inever heard good or bad on 9mm C-mag sounds cool a 100 rds.