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This is the Bushmaster XM15 M4A3 .223/5.56mm 16" Upper Receiver/Barrel Assembly. Complete Bushmaster Upper Receiver With A3 Removable Carry Handle, 16" M203 Step Barrel, A2 Front Sights. No magazine included with this upperFeatures include charging handle, forward assist, ejection port cover, bolt, bolt carrier assembly. Barrel is 1 in 9" twist. Bushmaster's 16" chrome lined barrels provide excellent accuracy with standard .223/5.56 ammunition. This is a pre-ban style upper and includes a bayonet lug and flash hider.
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