I got a couple of these and I have had ZERO issues. I talked with a guy at SF and he gave me some insight on the magazine. Mike told me there were some issues with the mag on specific weapons. SF actually put a sticker on some of the mags and said you may have issues with the mag, I think the biggest offender was the HK 416. one of his recommendations was to get a magpul thumb pull for 308 mags. install it on the bottom of the SF mag.I see a surefire mag on your 16, How well does it work? I keep reading negative reviews on them.