The Smith & Wesson M&P15T is an AR-15 Upper Receiver Assembly which is built on the M&P15 modern sporting rifle platform. It's chambered in 5.56x45mm Nato and features a 16" barrel with a 1 in 8" 5R rifling for reduced copper fouling and cleaning times. It also features an A2-style flash hider, MBUS front and rear sights, and a 10" free-float, lightweight quad handrail with ergonomic width. The MBUS front and rear sights feature impact resistant polymer that provides light weight and resists operational abuse. Spring-loaded flip up sights easily activated from either side or by pressing the top. The Smith & Wesson M&P15T is an excellent choice for anyone looking for a tactical upper with amazing features.