Chambered in 22 ARC(Advanced Rifle Cartridge) this 22 ARC ENDEAVOR® equipped with a 20 barrel delivers 22-250 performance out of the lighter weight AR15 (Mk4) platform. – Each CMMG® ENDEAVOR rifle is purpose-built for long-range performance with everything from the Magpul® MOE® rifle stock to the ZEROED muzzle brake and every part in between selected for its utility to the avid marksman. – The EML 15 handguard maximizes customization potential. M-LOK® attachment slots at the 12 3 6 and 9 o’clock positions give you plenty of real estate to mount accessories while the Picatinny rail sections allow for easy and solid mounting points for sights and accessories. – Platform Mk4 – Caliber .22 ARC – Operating System Direct Impingement – Barrel Length 16.1 – Barrel Twist 1:7 – Barrel Contour MT – Barrel Material 4140CM SBN – Barrel Twist 1:7 – Muzzle Device CMMG ZEROED Muzzle Brake – Muzzle Thread 1/2 x 28 – Gas Port Location Rifle – Gas Block Adjustable 0.750 – Upper Receiver Billet 6061 T6 Aluminum – Lower Receiver Mk4 Forged 7075 T6 Aluminum – Hand Guard CMMG EML15 M-LOK – Finish Cerakote – Charging Handle CMMG ZEROED Ambi – Pistol Grip CMMG ZEROED Pistol Grip – Buffer Type Carbine – Receiver Extension A1 – Stock / Brace Magpul MOE Rifle Stock – Trigger Type ZEROED Drop-In Single Stage – Trigger Guard CMMG ZEROED Trigger Guard – Safety Selector CMMG ZEROED 60/90 Degree – Magazine CMMG 10rd – Weight 6.8 lbs – Length 39.8