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This is not a Glock Factory Product, it is an after market Product
Manufacturer Number: PGG4MF
Allows use of factory interchangeable backstraps
Keeps debris out of the rear cavity of frame
Easy install
Fits:
Gen 4 Glock 17, 18, 19, 22, 23, 24, 31, 32, 34, 35, 37, 38