DPM Mechanical Recol Gen 4 Captured Version Reduction System Glock 20/21/41/41SF Stainless MS-GLG4/3 CAPTURED. S 7.380.487 B2 and US 7.493.845 B2) Multi-spring Recoil Reduction System and functions due to the multi spring intricate rod (3 springs)....
DPM Mechanical Recol Gen 4 Captured Version Reduction System Glock 20/21/41/41SF Stainless MS-GLG4/3 CAPTURED. S 7.380.487 B2 and US 7.493.845 B2) Multi-spring Recoil Reduction System and functions due to the multi spring intricate rod (3 springs)....