This Cylinder head is designed to be a direct replacement for the VSR10/Echo 1 PSR Sniper Rifle. The cylinder head is constructed out of Steel providing increased durability. Have the cylinder replaced just in case your original part does not provide the feeding or air compression it once did. It may fit with other airsoft guns but this cannot be guaranteed by Airsoft GI. We recommend that you consult or get assistance from an experienced Airsoft technician prior to attempting installation.