XM-177E2 CAR-15

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	Weapon: XM-177E2 CAR-15 Type: Carbine Country of Origin: United States Year Adopted: 1967 Caliber: 5.56x45 NATO Action: Select Fire Overall Length (mm): 838.0 Overall Length (in): 32.99 Weight (kg): 2.00 Weight (pounds): 4.41 Effective Range (m): 250 m Effective Range (yards): 273.4

The XM177E2, a member of the Colt CAR-15 family, was a compact carbine developed during the Vietnam War as a lightweight, versatile weapon for U.S. troops, particularly special forces. Based on the M16 platform, the XM177E2 featured a shorter 11.5-inch barrel and a unique moderator that reduced muzzle flash and somewhat moderated sound. Chambered in 5.56x45mm NATO, it retained the direct impingement gas system and rotating bolt of the M16 but introduced an adjustable aluminum stock to enhance its portability and utility in confined spaces.

The XM177E2 was produced in limited quantities between 1966 and 1968, with Colt manufacturing approximately 50,000 units under the military designation Model 629. Its compact design and high rate of fire made it well-suited for reconnaissance, jungle warfare, and operations by special forces like the MACV-SOG. While it gained favor for its lightweight and maneuverability, it also faced criticism for reduced effective range and accuracy compared to the standard M16, as well as mechanical issues like fouling in harsh environments.

The XM177E2 remains a notable milestone in the development of modern carbines, influencing later designs such as the M4 carbine. Its service in Vietnam cemented its legacy as a weapon tailored to the evolving needs of asymmetric warfare. Collectors and historians value the XM177E2 for its association with the Vietnam War and its role in shaping the development of compact, modular rifles. While modern carbines have surpassed it in terms of performance, the XM177E2's design ethos persists in contemporary military and civilian firearms.