Airsoft Masterpiece Sear Spring M4 and M16 Series Fit for every head size

Fit for every head size with its rear adjustable and wide straps

The V2 is the most popular model for most common guns

Glass filled polymer construction

A two-pack of buckings (one 60 degree and one 70 degree) for AEGs - see compatibility below (may work with more models)

Airsoft Masterpiece Sear Spring M4 and M16 Series Fit for every head sizeFeatures: High strength spring steel construction Improves trigger break Consistent, light trigger pull For: Tokyo Marui, WE, KJW, Socom Gear, WELL and other Tokyo Marui WE OEM and clone Hi capa series. Compatibility: For WE Tech 3. 5, 4. 3, and 5. 1 Hi CAPA Series Airsoft GBB PistolsMaterial: SteelManufacturer: Airsoft Masterpiece