Strike Industries GEN3 Magwell, Fits Glock 17/22/31/34 Gen 3, Black SI-G3-MAGWELL-17 Introducing the Strike Industries Gen. 3 Magwell for GLOCK 17! SI's Gen 3 Magwell was designed to provide easier reloading of the magazine while adding a stylish look. Compatible with most aftermarket magazine base plates and extensions. (Also compatible with G22 / G31 / G34) *Not compatible with backstraps installed on the GLOCK frame.