AirsoftPro show the Snow Wolf M24 M150 Upgrade Set that they offer to those who buy the M24 airsoft sniper rifle from them... "Only at AirsoftPro you will get FOR FREE the AirsoftPro M24 UPGRADE SET: M150 spring, CNC piston and 7mm steel spring guide, which simply increases the muzzle velocity up to 500 FPS (150 m/s)!

Compared to the original plastic piston and spring guide, you get more durability and performance for free. The CNC piston has a backpressure piston head for better sealing and a larger piston catch area for greater reliability. The steel spring guide can handle with powerfull upgrade springs without any problems."