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AR-15 Upper Build Kits
by Brownells
In stock at Brownells - Use Coupon M6S for free shipping over $49 til 12/31/17
on 1-1-2018.
Product Description

The Kit contains the basic parts to help you build an AR-15 upper.  It Includes a stripped upper receiver, a forward assist assembly, an ejection port assembly, a charging handle, and a complete bolt carrier group.  The upper receiver is forged from 7075-T6 aluminum and has M4-type feed cuts inside for reliable feeding.  It is compatible with standard or mil-spec lowers and components.