Worked as expected
I bought 2 metalform10 round mags for my cmmg dedicated 9 mm ar lower and upper. Both have worked flawless with about 200 through each mag.
the cure for 9mm feeding in ARs
I have had this American spirit arms 9mm conversion for some time now. The modified uzi mag that came with was so so, I even bought some uzi mags and modified them myself on my mill. Couldn't get 100% feeding corrected. contacted ASR for a fix they just blew me off. Saw this mag on sale bought it. PROBLEM FIXED SENT 10 MAGs FULL DOWN RANGE NOT ONE FEEDING OR EXTRACTION PROB.I just wished I had bought them sooner. I would give it a 10 star if poss, it has fixed my 9mm conversion........Going to buy more even if not on sale that's how good they are. fit and finish great Ar just looks funny with a short mag.
Excellent when they fit correctl.
The mags are solid and well made. But I'm only giving 4 stars because the first mag I got would barely go in and out of the magwell. My other 9mm mags from Brownells worked fine so I didn't figure the magwell was out of spec. Fortunately they exchanged them no problem and the second one worked great. So check the mags as soon as you get them I guess is the lesson learned. Love the shorter 10 round mags in my pistol. Much easier to pack and store.
needs work
I had to enlarge the hole that the magazine catch uses to lock the mag in place. After that it worked fine.Never had to do that with Colt mags.
Fire your engineer and or your designer!
Where do i start. Bought two of them they both have the same failures. Both had incorrect feed lip angels , both followers had angels to steep at the face of the feed lips. The combination of these issues caused the mags to fail miserably in all three 9mm carbines i tested them in. To add insult to injury the mags in all three guns which all have different manufactured mag blocks would stick in the mag well and needed to be yanked out . Metal form really dropped the ball on this one. I seriously recommend that you drop this product Brownells.
Metalform 10 Round Mags Do Not Function
We ordered ten, 10 round magazines for the California market to be sold with our 9mm AR upper units. None of them would feed. They all double fed or had several rounds shoot up prematurely causing jams and malfunctions. The larger capacity mags work flawlessly, but I would stay away from the ten round magazines until they get it right.