R66 Assault Rifle

The R66 Carbine Weapon System (known officially as the 7.62x51mm, Robinson Model-66/Alpha-Variant Individual Combat Weapon System (Carbine) or colloquially as the M66 Carbine) was a carbine rifle that was popularly used in the latter half of the twenty-sixth century. Popular among special forces operators because of its balance between size and power, it was used by organizations such as the United Nations Space Command Defense Force, Colonial Security Command, and a number of private security services.

The R66 CWS was well noted for its versatility; the base variant's RIS boasted a total of six universal sliding rails capable of supporting a plethora of various attachments (it should be noted the two "top rails" are connected, although they have unique widths).