Luth-AR 308 Barrel Nut Black. 308Barrel Nut is made for DPMS pattern upper receivers and is 1-7/16 x 16TPI (DPMS). Specifications for Luth-AR Barrel Nut .308: Manufacturer: Luth-AR Color: Black Gun Model: AR-10 Condition: New Finish: Anodized Projectile Caliber: .308 Caliber Caliber: .308 Winchester Features of Luth-AR Barrel Nut .308: Shipping Weight .5 lbs Shipping Dimensions 3 x 4 x 3 in Package Contents: Luth-AR Barrel Nut .308 What firearm models does the manufacturer say Luth-AR Barrel Nut .308 is compatible with? The manufacturer says that Luth-AR Barrel Nut .308 is compatible with AR-10Luth-AR 308-BL-16: 308 Barrel Nut Black