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Direct Impingement Operated see *****CMMG Item Number: 55A8DC0-AB Semi-Automatic AR-15 Pistol ***********Direct Impingement Operated 5.56x45mm (also accepts .223 Remington) 30 Rounds Mk4 Forged 7075-T6 Aluminum Lower Receiver Billet 6061 T6 Aluminum Upper Receiver 10.5" 4140 Chrome Moly Steel Barrel with a 1:7" Twist Carbine Length Gas System 0.750" Non-Adjustable Gas Block 1/2x28 Threaded Muzzle Optics Ready Picatinny Rail CMMG Zeroed 5.56mm Linear Compensator CMMG Zeroed Polymer Dust Cover CMMG Zeroed Ambidextrous Charging Handle CMMG Zeroed Pistol Grip CMMG Zeroed Ambi 60/90 Degree Safety Selector CMMG Zeroed Trigger Guard CMMG Zeroed Ambi Mag Catch CMMG Zeroed Extended Mag Release Button CMMG Zeroed AR-15 Bolt Catch CMMG EML9 M-LOK Hand Guard CMMG 6-Position Buffer Tube Carbine Buffer CMMG Ripbrace Pistol Brace Mil-Spec Single Stage Trigger Weight: 5.5 lbs Overall Length: 26" Color: Armor Black Cerakote Finish

Hi Brad and welcome. This model uses plain jane DI. Cheers and stay safe!