Barrel nut For NSR / M-LOK Free Float Handguard Rail Mount .223/5.56 (AR15)Spec

For .223/5.56 (AR15) Handguard Spec  
For : Key Mod or M-LOK Handguard
Color: Black 
Barrel Nut Optional : Steel  / Aluminum 
Steel Barrel Nut Weight:80g 
Aluminum Barrel Nut Weight:30g 

Barrel nut inside hole diameter: 1.22 in 
Barrel nut outside diameter: 1.36 in
Barrel nut mounting thread spec.: 1-1/4-18 UNC

Package：One Barrel Nut(Does not contain screws）