M91 Rifle

The M91 rifle, officially the Rifle, 5.56 mm, M91, is a selective-fire, gas-operated 5.56×45mm assault rifle developed in the United Commonwealths for the United Commonwealths military. It was reverse-engineered from the USUR-designed ADK-45 assault rifle. First manufactured in 1791, the M91 was the second major assault rifle created, and was made in response to the ADK-45's sudden power and strength.

Known to be reliable and durable, the M91 remains in service to this day. It was produced between 1791 to 1887 and spawned many modifications and variants. Due to its non-modular nature, multiple variants of the weapon have been created to serve various purposes, with different built-in equipment such as scopes. The M91A2 is one variant that eventualy became the main service rifle of the ULSMC.

Variants

 * M91A1- The basic variant of the M91 rifle, the M91A1 features wooden furniture and a machined receiver. As such, it weighs more than 5 kg, leading to complaints from troops during World War I. The M19A1 was the ULS's main weapon during the first world war, but was discontinued by 1825 with the introduction of the M91A2.
 * M91A1 Urban Assault- A variant of the M91A1 created during World War I, meant for urban combat. It is equipped with a bayonet mount. It was one of the most-produced variants of the M91A1.
 * M91A1 DMR- Designated Marksman Rifle variant. The M91A1 DMR is equipped with a medium-powered scope and a longer barrel, as well as an attachment point for a bipod. This variant of the M91A1 is still commonly in use today.
 * M91A2- A general-purpose upgrade to the M91A1, the M91A2 replaced most of the wooden furniture with polymer furniture to reduce weight. The barrel was extended and the stock made removable and replaceable. More modular than the M91A1, scopes and bayonets could also be added at will. The M91A2 proved popular and was the ULS's main rifle from 1825 onwards, and remains in use to the present.