5.56 Caliber
Chrome Molly 4150 AlloyBlack Melonite Finish
1 in 7 twist
Lightweight Contour with a Mid-Length gas system
Chamber 5.56X45 NATO
1/2X28 Threads
Weighs 25.3 OZ with gas block
Ships with 416 Stainless pin-on lo pro gas block in black melonite finish **DOES NOT INLCUDE A GAS TUBE**