The 100 Series features classic furniture appointments such as the beloved A2 pistol grip and a 6-position butt stock. Chambered in 5.56x45mm, this AR is ready for the range. The Mk4 platform accepts standard AR15-style magazines, and is the most versatile of the CMMG platforms. CMMGs RESOLUTE rifle and carbine lineup is engineered with purpose for those who refuse to compromise on quality. Each RESOLUTE rifle is designed for balance, accuracy and maneuverability. Whether your'e defending your family or looking to bring out your best at the range, the RESOLUTE keeps going when you need it most.