WELL Upgrade Set For MB01, MB05, MB06 AND MB08

A high-power Upgrade Kit for your WELL MB Series Sniper Rifle, that will take your output FPS up to a massive 550FPS w/ 0.2g BBs. This drop in Kit comes supplied with a hard Aluminium Piston, a 550FPS Main SPring and an Aluminium Spring Guide w/ Bearings. If you own a WELL MB-01/MB-05/MB-06/MB-08 and want to take it's performance to the next level, then this WELL Upgrade Set is exactly what you need.