With its 16″ barrel at the heart of its design, the M15TAC16 blends rugged durability with exacting precision. The tactical handguard’s slim, octagonal profile sports a full-length MIL-STD 1913 12 o’clock rail for sights and accessories. The adjustable gas block allows the user to tune the rifle for their preferred ammunition and/or suppressor use. Like all tactical series rifles, it comes standard with Magpul MBUS flip-up sights.