The Colt SMG, a 9mm variant of the AR-15 platform, was developed to compete with the HK MP5 for law enforcement. It features a closed-bolt, blowback action, distinct from the AR-15's direct impingement system. Modifications include Uzi-based magazines with AR-style release notches and a bolt hold-open feature, a plastic gas deflector, and upgraded fire control pins for durability.
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