Product Description Specifications 1.375x24 HUB Model: CAT/NOAH/A1Caliber: 6 mmWeight Titanium: 8.6 oz (Core) *Weight Inconel: 16.8 oz (Core) *Overall Length: 6.15”Diameter: 1.60″Min Barrel Length (Titanium): 10”Min Barrel Length (Inconel): 8” (5.56NATO)Recommendation: Semi-Auto 6mm (and 5.56)Finish: DLCMounting: 5/8×24 Direct Thread (Included) FFL: YES Caliber: 6MM-556NATO