A demonstration on upgrading the recoil spring and rod on a Glock 21 SF.
Glock 21 SF Specs:
- Caliber: .45 Auto
- Length: 204 mm / 8.03 in
- Width: 32.5 mm / 1.27 in
- Length Between Sights: 172 mm / 6.77 in
- Height: 139 mm / 5.47 in
- Barrel Height: 32 mm / 1.26 in
- Barrel Length: 117 mm / 4.60 in
- Weight Unloaded: 745 g / 26.28 oz
- Weight Loaded: 1085 g / 38.30 oz
- Trigger Pull: ~2.5 kg / ~5.5 lbs
- Trigger Travel: 12.5 mm / 0.49 in
- Barrel Rifling: right hand, hexagonal
- Length of Twist: 400 mm / 15.74 in
- Magazine Capacity: Standard 13