CMMG RESOLUTE 300 MK4 16.1" 5.56MM - TITANIUM If you want the best an AR has to offer, then the 300 Series is your choice. This AR is fitted with every desired feature including a choice of ten Premier Cerakote colors, laser engraved model name on the lower receiver, updated ambidextrous controls and sling points along with a premium trigger, Magpul grip, PRS stock, CMMG's revolutionary RIPSTOCK or RIPBRACE, and CMMG's SV muzzle brake. These are just a few of the possible upgrades on this series. Chambered in 5.56mm, this AR is ready for the range.