By BLACK REEF

Specifications: 

• Integrated inertia piston with 2 springs to transfer recoil in "newton's cradle" fashion.

• Application: standard (mil-spec) buffer tube for ar15

• Drop in system​

• buffer mass(36g/ea, 3 sets of shims; 3.8 oz total)

• ENGINEERED AND PRODUCT OF USA, Pat. Pending