Bushmaster's ACR (Adaptive Combat Rifle) redefines the term "modular" with the extraordinary ability to change calibers, barrel lengths, and stock configurations in minutes, without the use of tools. A versatile and adaptive rifle, it was built specifically for law enforcement and commercial markets. It's tested and proven reliable in the most brutal conditions on earth. The ACR features fully ambidextrous controls including magazine release, bolt catch and release, fire selector, and non-reciprocating charging handle. The high-impact composite lower receiver has a a textured magazine well and modular grip storage. The adjustable, two-position, gas piston-driven system allows for suppressed or unsuppressed firing, and the 16.5" cold hammer-forged barrel (5.56mm/.223 Rem) is FNC-treated for maximum durability, longevity, and reliability. The folding, multi-position telescoping stock has a rubber buttpad and sling mounts. The Enhanced ACR model has a three-sided aluminum handguard with integral MIL-STD 1913 rail for accessories, two-point quick-attach mounts for sling attachment, and an AAC 51T Blackout flash hider. This ACR has a Trijicon ACOG designed to the exact specifications of the US Special Operations Command for use by elite US forces, no other magnified optic has been used more in combat than the ACOG. This Trijicon ACOG TA01NSN is Trijicon’s most popular ACOG. The ranging reticle allows for bullet drop compensation out to 600 meters without any manual adjustments. The reticle will appear black during the daytime and will glow amber in the dark, thanks to Trijicon’s patented tritium illumination. No batteries needed! Like new condition - fired less than 90 times.