Rifle AR-15
The Resolute 100 Mk4 full upper receiver assembly includes everything you’ll need to connect your AR-15 bottom receiver to it. This upper receiver is designed to work with AR-15 bottom receivers that follow the Mil-Spec layout. Whether you enjoy plinking for fun or need a reliable rifle for varmint and pest control, CMMG’s Mk4 Resolute 100 full upper receiver assembly is the only upper receiver you’ll ever need!
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