Colt AR-15
The Colt AR-15 was a semi-automatic rifle used on Earth in the late 20th century. It was a civilian variant of the M16.
In 1996, with police approaching their compound, the members of an anti-government militia armed themselves with Colt AR-15 Sporter-1 rifles. These weapons were equipped with A2-style handguards and birdcage flash suppressors0.(VOY: "Future's End, Part II")