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John-Micahel : The barrel is threaded with a 49/64-20RH thread pattern. This model features: a flat-top receiver, 16.5" chrome moly, 1:20 twist barrel, barrel threaded 49/64-20 RH, low-profile gas block, Manticore Arms Transformer Rail handguard, B5 Systems SOPMOD BRAVO Collapsible Stock, and a standard AR-15 trigger. Comes in Flat Dark Earth(FDE), OD Green, or Black. Direct impingement operating system. Standard-specification lower receiver assembly with our name, logo, and caliber engraved. Ships in an Alexander Arms® soft carry bag with one 7-round magazine and 6 panels (2 sets of 3). You can find muzzle brakes for sale from the manufacturer here www.shopalexanderarms.com/Parts_Accessories-Muzzle_Devices.html
John-Michael, this rifle has a 16.5" Chrome Moly Barrel with a 1:20 Twist and is Threaded 49/64x20 TPI RH with Thread Protector.