The revolution di (direct impingement) features the same technology, durability, features, and ar-15 size, but in a smaller direct impingement system featuring a 9-position adjustable dictator gas block and renegade rail.The dictator adjustable gas block lets you tune your rifle to the exact operating speed it should be.Its adjustable settings and included a straight gas tube, you and your rifle are set for just about any situation.Its patented e2 dual-extraction technology consists of four small channels cut into the walls of the chamber allowing a small amount of gas pressure to push against the neck of the spent case.The match-grade chrome-moly barrel is 5r button rifled with polygonal rifling for extreme accuracy and finish with a nitride for unsurpassed strength, heat and corrosion resilience.The revolution di rifle also utilizes a non-adjustable single-stage and a mil-spec aluminum anti-tilt buffer tube which features "carrier cradle" extensions to ensure that the carrier is always supported by the buffer tube and has three drain holes.Metal Finish: Black Hardcoat AnodizedAction: Semi-AutoCaliber: 6.5 CreedmoorBarrel Length: 20"Capacity: 20+1Safety: AmbidextrousOal: 40.50"Weight: 8.60 lbsStock Description: Adjustable Magpul PRSMuzzle: Triple PortReceiver Material: AluminumSights: None, Optic ReadyTwist: 1:8"Barrel Length Range: 20" to 21.99"Weight Range: 8 lbs to 8.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black