These sp50 upgrade parts are made for the strike master sp-50 foam blaster.

Improve the durability, firepower and shooting range of sp50 blaster.

Recommend 8 or 10kg spring, the 12kg and 14kg spring is bit powerful.

Specifications:

Material: metal.

Spring type: 8/10/12/14kg.

Barrel length: 147/165/185mm.

Barrel OD: 16mm.

Barrel ID:  13mm.

Piston size: 27*25*69mm.

Package includes: 1x sp-50 upgrade part.

SP50 Strike Master Blaster Upgrade Guide Video