Caliber: 5.56 NATO. Barrels: 16.1”, 18”, or 20”; 1:8” twist rate; muzzles threaded 1/2x28. Weights: 7.5 to 9.25 lbs. Manufacturer of several models of AR-style rifles and carbines. Many AR-type options are available. Hybrid between OBR and PredatAR 5.56x45 Rifles. Can be broken down and stored into the optional Rollup Bag and Toolbox. The handguard has a locking stainless-steel QD lever system to slide off the upper assembly in seconds. Barrel can be removed with supplied wrench, no need to remove the gas tube, gas block, or muzzle device. No conventional AR barrel nut; handguard bolts directly to the proprietary upper receiver, free-floating barrel. Zero-MOA upper rail. Adjustable Port Selector Technology gas block for sound suppressor use. LaRue Tactical six-position Retract Action Trigger (R.A.T.) stock, A-PEG grip. Introduced 2012. Made in the USA. SEE POLITICAL PANIC PRICING.