I had two issues with mine. First, I ordered 5 additional Thermold magazines from Kel-tec. With the one that came with it, that gave me 6, and 5 of the six had the follower get stuck in the bottom when fully loaded. Sent them back to Kel-tec and they sent me 5 new ones, no problems with the new ones. Second, it would not go into battery after about 2-3 rounds, happened with all of my mags, even some surplus FAL. Adjusted the gas from scratch and the problem was solved. I only run NATO, 147 grain, with brass case through it.