"I own both a SRC and a CA M4A1. The magazines metal construction is great and they feed well into both rifles. I also like the color of the magazines, rather than the greyish color that most m4/m16 magazines have.
I highly recommend these magazines for use in all your MIL-SIM games. (I'm sorry, when both teams are running around with hi-capacity magazines, that is not a military simulation)"