Supposed to work with a standard follower although you can buy just the followers. Although the capacity is supposed to be 10 rounds, the more I read about it most just put 8 rounds in for.reliabilty. I have an 8 inch pistol and have not gotten it to run right. I was using a Armaspec captured buffer. @Jake turned me on to a spring for it and I picked up a tungsten weighted buffer as well. I have not run it yet so stay tuned.Same mag body, just change the follower? Or just jam em in anyway?