What is the barrel length of the M4A1 service rifle?

The M4A1 service rifle features a barrel length of 14.5 inches (368 mm). This specific barrel length is a defining characteristic of the M4A1 and contributes to its versatility as a lightweight, maneuverable carbine suitable for urban and close-quarters combat scenarios. The shorter barrel allows for easier handling in tight spaces, making it a preferred choice for various military operations.

In contrast, other barrel lengths, such as 16 inches, 18 inches, or 20 inches, are typically associated with different variants of the M16 or AR-15 rifles. While those models may excel in different contexts, the distinct design and operational profile of the M4A1 is best served by the 14.5-inch barrel, balancing compactness with effective performance.