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yes it is 1/2x28 specs from cz site see ****Product Name CZ 805 Bren S1 Pistol SKU 91361 Firearm Type Handgun Purpose Home Defense MSRP $1,799.00 Chambering .223/5.56 Magazine Capacity 30 Magazine Type AR-15/M16 Frame Aluminum Grips Polymer Sights Flip-up, 2 rear aperture sizes Barrel Length 11 in *******Barrel Cold hammer forged, *******muzzle threaded 1/2x28 Weight 6.7 lbs Overall Length 22.75 in Safety Ambidextrous thumb