Doublestar M4 16" Barreled Flat Top Upper Less Carrier & Chargin
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4140 chrome moly steel, 16" DS-4 barrel is mounted on aircraft quality aluminum upper. Barrels are plated evenly with tough parkerized finish. Comes fully assembled (minus bolt/carrier and charging handle) with forward assist, ejection port cover assembly, gas tube assembly and heat shielded hand guards. 1X9 twist rate.