This complete Smith & Wesson 5.45 upper reciever assembly features an M4 profile chrome-lined barrel chambered in 5.45x39 mm Russian. The flattop A3 upper receiver features M4 feed ramps to ensure reliable feeding. The barrel is made of 4140 steel and has a 1 in 8 twist with 1/2"-28 threads and an A2 flash suppressor. The upper comes with standard 2-piece polymer handguards, M4 forged front sight assembly and a picatinny railed upper ready for your choice of rear iron sight or optic. Includes one 30-round magazine.
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