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I own all the components you asked about..I had to shave some off the the stock, ahead of the magazine..if you look the tapco one has a larger "Head" on it..prevents the mag from going in..maybe on purpose..cut back the stock it'll fit slick..mine does..
The first pic shows where the lip on the mag (pen is pointing) restrictes the travel of the round, which wont let it chamber.
The second pic is of the lip outside the gun. Im going to grab a file and reduce that lip but am leary once I do the mag wont hold and rounds without it.