VSR well upgrade kit
Well VSR10 Airsoft Rifle Upgrade Kit for MB02, MB03, MB07 & MB10
Performance Upgrade Kit for Well VSR10 Airsoft Sniper Rifle Series
Complete with Upgrade Spring, Upgrade Metal Piston, and Upgrade Metal Spring Guide with Torque Absorbing Ball Bearing
Easy Installation and More than 20% Power Increase to Approx.