The G21 mag will fit. You can also buy a +2 (maybe a +1 extention) for the bottom of the standard mag that will give you a place for your pinky. Lone Wolf Distributors - Product Detail - PG +2 Grip Extension 45/10mm - $9.49
http://www.midwayusa.com/product/590...-polymer-black


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But you are right Jake, that if one pushes or pulls against the extended portion of a longer magazine it could cause the pistol to mal-function. The mag ext. don't cause this problem.
