Available in FDE or Black The M4 Super Precision series of scope mounts are optimized to be used with an M4 upper receiver. These mounts are available in either tube diameter. This allows you to get the perfect length for your chosen scope, ensuring it fits on your rifle easily. While these scope mounts use the classic nut and bolt method for clamping to the Picatinny rail, they use an updated design. This means they are more secure, as each nut and bolt combination provides over 1,000 pounds of clamping force, which is more than any lever mounting arrangement. It also keeps the scope steady and zeroed even after repeated firing.