ArmaLite's M15TAC16 blends rugged durability with exacting precision. It has a chrome-lined chrome moly barrel, tactical aluminum handguard with a slim, octagonal profile that sports a full length MIL-STD 1913 12 o'clock rail for sights and accessories. This rifle has a Magpul STR multi-position collapsible buttstock, Magpul MBUS flip-up sights, and a flash hiding compensator. This model has a 16 barrel and a mid-length gas system with an adjustable gas block.