Not for steel case bullets - Duramag 7.62x39mm Stainless Steel 5 Round Rifle Magazine

I bought this hoping that it would work with my Bear Creek 7.62x39 upper, the answer is, it depends. When I loaded Steel Cased bullets the rounds hang up in the magazine. I checked YouTube and there were all sorts of fixes to the various mags from different manufacturers, unfortunately none of the fixes pertained to the issues with this particular magazine. There are two dimples on each side of the curved top of the magazine. When you manually push a bullet forward, the recess between the primer base and the main body of the cartridge is hung up on the first dimple, then, as you continue to push the round forward, the second dimple again hangs up the round. It takes quite a bit of effort to get the steel case round to eject from the magazine. Also, I think that the corrosion prevention coating on the casings deter the round from smoothly ejecting from the magazine. I haven't been able to cycle, let alone shoot, a single steel cased round.

On a positive note: This magazine seems to like BRASS casings which seem to cycle quite nicely.