FEATURES-Caliber: .308 Winchester-Twist: 1:10"-Length: 18"-11-degree Polished Target Crown-Weight: 2.25 lbsPRODUCT SPECIFICATIONS:Dimension 1.25 X 1.25 X 19.15Height 1.2500Width 1.2500Length 19.1500AR-15 ACCESSORY YCALIBER 308 WINFINISH BLACK MATTELENGTH IN INCHES 18.0000SIGHTS NFLUTED YTHREADED YOTHER FEATURES: RIFLE LENGTH GAS PORT. .750 GAS BLOCK SIZE. 11 DEGREE TARGET CROWN ENSURES ACCURACY. 5R RIFLING. HEAVY FLUTED NICKEL TEFLON COATED EXTENSIONNO DIRECT SHIP TO CALIFORNIA