My DW and Sigs aren't fussy about mags. My Colt on the other hand, only works with Colt branded Checkmate stainless mags (non-dimpled follower, hybrid feed lips). The Rock, well it's too soon to tell...
The DW came with a USGI 7 round mag. I bought Chip McCormicks, Wilsons, and Colt branded Checkmates. I like the Colt branded Checkmates the best, but I have had a problem with the springs getting compressed after a while.
