I purchased a couple of these for my Beretta 92FS and I'm planning on purchasing a CX4 Storm this week, the mags arrived and looked and felt great. You can see and feel the quality in these.
I suspected that the springs in these would be very stiff initially as they were in my 15 round mags. I started loading and only made it about 20 rounds in before I had to turn to one of my pistol magazine loaders. I loaded it up to about 25 and then it started getting tough even with my heavy duty pistol loader. I was able to get the 30th round by pressing both my hands down on the pistol loader. It'd be impossible to handload one of these new, which is kinda disapointing. But hopfully the springs will mellow out over time.
Anyways, the main reason i'm giving this 3/5 is because the spring is actually so stuff that it wont load into my 92FS comfortably with 30 rounds. I literally had to shove it in. When I pulled the mag back out there was a crease in the bullet casing from the pressure. I took 1 round out and then it fit fine.
Beretta makes great quality products, but the springs on your magazines are out of this world strong. Using one of these fresh out of the box fully loaded will damage your thumb, your pistol loader, and your gun. Kinda unfortunate I cant use this out of the box to its full capacity.
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