ProMag magazine bodies are constructed of high carbon heat-treated steel and TIG-welded for strength. The springs are precision wound using heat-treated chrome silicon wire. Bases and followers are injection molded from polymers selected for their durability. The result is quality, consistency, durability and reliability.
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They fit great , work great and was a great value
I have six of these, they all function perfectly. They fit rather tightly in my rifle, but that could be easily remedied with light file work. With use they loosen up, as the coating wears down. Have not had a single feeding problem. Rugged and well made.
Low price, great product, this is my go to compa y for anything 9mm ar. Feel sturdy, haven't ran them but not worried. Bought a polymer one and it runs fine but bulges a bit when fully loaded. I'll stick pile these.
Save your money and do not buy PROMAG products.This mag would not even fit promag brand block.
I bought 2 of these mags for my new 9 mm build. Out of the box, they would not lock into my lower receiver. It took me about 30 minutes per mag with a file and a blue marker relieving material to get them to insert, lock in place, and drop freely. All of the material was removed from the top, outside of the mag just under the feed lips. Also had to take off a little material from the front of one of the (plastic) followers that was binding. Now that they're tuned, they run 100% in my gun. The BHO works, although the tab is small and just barely catches the bolt stop. They are built well out of relatively thick steel and I suspect they will last a long time. The phosphate finish is very durable.
If you want to take these out of the box and go shoot, they may not be the right mags for you. There are other mags available that are more expensive, but fit and run 100% out of the box. If you do not mind tuning them to fit your gun, then I think these are a bargain. Of course, YMMV.
I give them 4 stars because I had to spend a lot of time tuning them, but when done, they run 100% and were inexpensive.
NO TROUBLE HERE. mag slides in and drops out i will have to order more of these.