A couple weeks ago I was at the range shooting my DPMS LR-308 and discovered I had some bad magazines. The bolt would not go home and kept jamming. With some experimenting I discovered the mags would not latch in with the bolt closed either. The notch was too low on the mag. I emailed C Products about my problem and immediately received a polite response telling me the compnay had gone out of business about a year ago. This was about the time I bought these and never had them out of the plastic wrapper. The gentleman said they are now C-Products Defense co. and to send him the mags and they'd exchange them for some new ones. I had no idea where the receipt was but I sent him the 4 mags that were problematic. Today I got four new ones, no charges, and a set of free rail covers as a bonus! Their motto is "Your rifle is only as good as its mags." Next time you're in the market for mags check them out. Yes these work and I learned a lesson to always check new gear BEFORE you need it.