The Gen4 is based on a full-size G17/G22 MBS (multiple backstrap) frame with a reduced short-frame trigger mechanism housing. The multiple backstrap system allows the user to change the circumference of the grip to fit his or her individual hand size. The grip angle of the Glock “Safe Action” Pistol is not changed by backstrap modifications. The magazine release catch of the Gen4 is reversible and enlarged. The reversible magazine allows users to switch the catch to the left or right side of the pistol with no additional parts. Internally, the original recoil spring has been replaced with a dual-recoil spring assembly. The dual-recoil spring assembly noticeably reduces recoil while simultaneously increasing the life cycle of the assembly.
