Well built, nice fit04/03/2014 ByPhilip Bumgardner The magazines work great with my M+M M10. Nice snug fit, there is little to no wiggle. These seem to work A LOT better than the poly mags I have, Tapco and Magpul. I have had to file down on the poly mags, but these steel ones go in and out without any issues. I would highly recommend them, and the price is great too.