One of the reasons that magpul products work so well is the amount of research, development, and testing they go through. I'm sure 50 round and up are in the works and will be released when they can be as rock solid dependable as the predecessors. You know, they need to make sure the curvature of the mag is optimal and the spring and follower will feed 100% of the time and all that.

But I totally get it that 10 extra rounds just doesn't do it for some people.

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686/M&P9 Pro/M&P15X/M&P15-22