(we changed all our springs with durable and stronger material)
1: Fitting any of our spring guiders to your rifle may change the muzzle energy.
You must check the legal limit allowed in your country.
2: You should thoroughly test your rifle after fitting.
3: If in any doubt, ask a qualified person to carry out the work.
4: Care and attention must be taken during the installation.
Model: No. 1
Outer (mm): 20
Inner (mm): 13.50
Thickness (mm): 3.25
No. Coils (mm): 30
Length (mm): 257
1x Storage tube.
1x Eaglevisionc springs grease tube NET WET: 7G
Recommended about 30 shot before cutting the springs down, 99% of the springs in the market get compressed by 2-5% when first time used, depending on spring diameter, wire diameter and number of the coils.