Sprinco 17lb Recoil Spring for GLOCK 20/21 Gen3

Strike Industries Reduced Power Recoil Spring, 15 lb, Stainless Steel - GRPS15

Wilson Combat Full-Size Flat-Wire Recoil Spring, 17 lb, Chrome Silicone - 614G17

GLOCK G20 GEN 5

Wilson Combat Full Size Flat-Wire Recoil Spring 20 lb

LANTAC S-KIT Upgrade Spring Kit Glock 17/19 Gen1-4 4.5lb Firing Spring

Sprinco USA Extra Power Spring Kit

1911 Progressive Recoil Spring - Prog. Recoil Spring 10lb.