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. 10 Round Magazine
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I have 3 of these magazines. They all seat and feed fine using my Pro Mag 9mm magwell block. They only reason I gave it a 4 star is the springs are so tight I cannot load more than 5 rounds by hand. I bought a loader from 9mm ar and now I can load them in no time without tearing my thumb and fingers up. Fast shipping and a great company to buy from.
I am pretty happy with promag I am using a Hahn bottom loading mag well adaptor I purchased three of them one of them will hold the bolt open out the last round other two do not but not a big deal very well-made I did purchase a couple of metalform magazine 10 rounders that do not feed correctly so pro mag worked very well not one jam in a 100 rounds