The SOPMOD Block 3 or more popularly known URG-I (Upper Receiver Group Improved) is a rifle pattern currently being used by several units of the United States Special Operations community. The URG-I is designed to be an upgrade over the venerable MK18 and SOPMOD Block 2 versions of the M4 and boasts improvements over its predecessors. Upgrades such as a slimline M-LOK rail system, improved bolt carrier group, and charging handle are some of the easy to point out differences between the URG-I and the others.
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