RIFLE: TROY DEFENSE MODEL CARBINE RIFLE, SERIAL NUMBER GJJ73131365, BLACK (MATTE), CASE NOT INCLUDED, SEMI - AUTOMATIC, 5.56 NATO, 16" TROY BARREL, INCLUDES SIG SAUER ROMEO 5 W/ HIGH RAIL ADAPTER, 13" TROY KEYMOD HANDGAURD, VG CONDITION. Notes: The Troy Defense Carbine (such as the standard 16" A3 Defender) is a rugged, gas-operated, semi-automatic rifle chambered in 5.56mm NATO / .223 Remington. Built upon an aircraft-grade 7075-T6 aluminum receiver with a MIL-SPEC hardcoat anodized finish, it offers a solid foundation for both tactical and sporting applications. It features a 16-inch barrel with a right-hand 1:7twist rate to stabilize a wide range of bullet weights, paired with a TROY flash suppressor to mitigate muzzle blast. The rifle utilizes a TROY dual rail stabilizer PDW adjustable stock that adjusts the overall length from a collapsed 33.3 inches to 36 inches extended. Outfitted with an ergonomic pistol grip and a free-floating M-LOK handguard, this American-made carbine provides plenty of rail space for custom accessories. To optimize rapid target acquisition, pairing this carbine with the Sig Sauer Romeo 5 red dot sight is a highly efficient choice. This compact 1x20mm optic features a crisp 2 MOA red dot reticle with 10 illumination settings, including 8 daylight and 2 night-vision levels to match any environment. It weighs only 5.1 ounces and boasts an exceptional 40,000+ hour battery life on a single side-loading CR2032 battery, heavily augmented by MOTAC (Motion Activated Illumination) "shake-awake" technology that automatically turns the optic on when movement is sensed and sleeps after periods of inactivity. When mounted using its 1.41-inch high riser mount, the Romeo 5 provides an absolute co-witness setup. This aligns the red dot perfectly with standard-height backup iron sights across the carbine's flat-top Picatinny rail, ensuring an optimal, heads-up shooting posture and ultra-low parallax for reliable point-of-aim performance.