Shop CMMG's .45 ACP AR-15 rifles and pistols. Experience hard-hitting .45 caliber power in a reliable AR platform. Radial Delayed Blowback technology ensures smooth shooting. CMMG, the leading …

Shop a full selection of .45 ACP caliber AR-15 rifles from top firearms manufacturers.

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Ideal for tactical applications or personal defense, our .45 ACP kits provide everything you need to build or upgrade your firearm. With premium materials and expert craftsmanship, these builds are perfect …

Our flagship AR-45 conversion kit provides the capability for an AR-15 rifle to reliably fire the .45 ACP cartridge with greater accuracy, capacity and versatility than standard pistols can offer.

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Our 100% American-made direct impingement (DI) and blowback (BB) uppers come in a variety of barrel lengths and are available by themselves or as part of a complete conversion kit.