GLOCK 20-21-41 Gen 4 (SF) allgen The system works due to

The system works due to the multi spring intricate rod (3 springs) which controls the functionality of the pistol and replaces the stock recoil without changing the configuration of the pistol

From this effect

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Furthermore

GLOCK 20-21-41 Gen 4 (SF) allgen The system works due toDPM MRS for Glock 20 21 41SF Gen 4 This system works due to the multi spring intricate rod (three springs) and controls the functionality of the pistol. The third spring which is contained within the rod controls the movement of the slide so it never rams on the frame. The system includes two different in length washers and two external springs. Washers differentiate only the buffer force (slide full open position) and the external springs