Our take: This ASG M140 Upgrade spring is great to increase your sniper rifle’s muzzle velocity to 460 FPS with 0.20g BBs. The M140 spring will fit the ASG Licensed ASW338LM Sniper Rifle along with the other VSR-10 variants.
Compatibility: ASG ASW338LM, VSR-10 Variants
Package includes: ASG M140 Spring
NOTE: Airsoft Megastore recommends that all internal upgrade be performed by a qualified airsoft technician. Airsoft Megastore is not responsible for damage to your AEG caused by improper installation. Make sure your AEG is compatible with this upgrade component BEFORE purchase. Any upgrades made to an airsoft gun while it is under warranty will VOID the warranty.