When it comes to AR-15's Colt set the standard. This is the brand that the US Military has relied on for over 40 years. The Colt M4 Carbine TACOPS was designed specifically for lightweight mobility, speed of target acquisition, and potent firepower. The Lower is stamped with the Colt Logo and Colt spelled out M4 CARBINE and has a SN# that starts with LE. With the 4-position buttstock fully retracted, the Colt Law Enforcement Carbine is less than 30.5 in (77.5 cm) in length and weighs only 7 lb - ideal for tactical deployment and traditional patrol. features include a tactical Quadrail handguard, Iron folding rear sight, sling swivel at the gas block, 16inch barrel with 1 in 7 twist 6 groove and heavy profile under handguard. The barrel is chrome lined and has the M4 feed ramps and the bolt carrier is the M16 type. Behind the bolt is an H2 buffer.