Chambered in .40 S&W the MkGSRESOLUTEuses Glock-pattern magazines, beloved for being lightweight, easy to find, and affordable. Ballistics don't lie, .40 S&W was designed to combine the best elements of 9mm and .45 ACP, giving you hard-hitting performance in a user-friendly package that's right at home in this pistol caliber carbine. After shooting the .40 S&W RESOLUTE, you will swear they were made for each other on day one.When full-size rifles are too cumbersome and pistols/SBRs don't deliver the long-range ballistic performance you need, the CMMG RESOLUTE line of carbine length rifles is the answer. Fitted with the suite of ZEROED parts and accessories as well as our legendary RIPSTOCK, the RESOLUTE is the rifle that's never out of place. The new EML(TM) 15 handguard brings style to the next level. M-LOKattachment slots are found where expected at the 3, 6, and 9 o'clock positions as well as on top at 12 o'clock with the omission of a full-length Picatinny section found on our previous handguard. This reduces weight while the additional M-LOK section still gives shooters a place to mount those must-have accessories.With the wide range in ammunition available, and the option for suppressed operation, the available Action Tuning Kit will allow you to tune your system even more for added flexibility and smoother operation.Radial Delayed Blowback(TM) Operating SystemOriginally developed for the .45 ACP MkG platform, CMMG has adapted our Radial Delayed Blowback system across our pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems. Check out our CMMG Resources article & video to learn more about what sets Radial Delayed Blowback apart.40S&W MkGs ZEROED parts and accessories- Quality comes standardThe AR platform is well known for its capability for customization but picking the right parts doesn't have to be a nightmare of homework. CMMG's ZEROED parts and accessories are made here in the USA with quality and attention to detail that is second to none and each RESOLUTE comes equipped with a slew of ZEROED parts standard, including:ZEROED Drop-In TriggerZEROED Pistol GripZEROED 60deg/90deg Ambi SafetyZEROED AR15 Ambi Charging HandleZEROED AR15 Bolt CatchZEROED AR15 Polymer Dust CoverZEROED Muzzle Brake 45ACPLifetime Quality GuaranteeWe aim to please, that's why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.~Firearms shipping to states with magazine capacity restrictions will only ship with 10rd magazines in place of standard capacity magazines. CMMG does not address any other state compliancy requirements for further restricted states.