Ultimate M170 POWER SPRING FOR AEG

Airsoft players have always looked for new ways to improve performance replica guns. The launching of the ULTIMATE Upgrade Series by ASG offers enthusiasts the opportunity to access a range of high quality upgrade parts. All springs, with exception of the M100 spring (16669) are chromium plated which minimizes the friction on the piston. The ULTIMATE® springs are named M100, M110 etc. according to their expected tension in meters per second – measured when using a 0.20gr BB and a 300mm long barrel. In turn, a M110 spring would give 110 m/s.