"I bought this for my AGM M4 to replace the crappy magazine that comes standard with it. Turns out, I didn't completely read the description and AGM isn't a brand that this fits. It's a really tight fit that requires an extreme amount of wiggling and force but once it's in it works like a charm. I'm going out on a limb and assuming putting it in the rifle won't be an issue for the brands listed as my case is probably unique. Not one single misfeed out of about 3 100 round tests. It also perfectly resembles it's AR-15 counterpart which gives it an awesome sense of realism.
So overall, shame on me for not reading the description, but the magazine works great minus putting it in the rifle in my case. Definitely would recommend this to someone as long as they have a rifle that fits it."