Personal defense calibers like 5.7x28mm have gained popularity in recent years, offering PDW (Personal Defense Weapon) ballistics with the classic style and balance of a carbine. If you're considering this setup, the RESOLUTE Upper Group from CMMG is an excellent choice. Pair it with either our MK57 Lower or a standard AR-15 lower group along with CMMG's 5.7 AR conversion magazines and you'll be prepared for the range or personal defense scenarios. Originally developed for the .45 ACP MKG platform, CMMG has applied their Radial Delayed Blowback system across their pistol caliber lineup. This innovative system reduces recoil impulse and optimizes bolt weight, providing a softer shooting experience compared to traditional straight blowback systems. For a detailed exploration of Radial Delayed Blowback, delve into CMMG's comprehensive articles and video resources. It's important to note that CMMG recommends using their .40 S&W MKGs uppers exclusively with MKGs lowers to ensure reliable functionality and performance.

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These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

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Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.