NJK Custom Stainless buffer - Carbine 

Solid stainless construction. Designed to add weight to the 16" carbine recoil system. The extra weight delays opening of bolt for less pressure on your brass at extraction. slows rate of fire in full auto mode. Drop-In installation. 

Stock carbine buffer weighs 2.9oz. 

M4 H weighs 3.77oz. 

NJK Custom Stainless buffer weighs 5.1oz.