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Wing Tactical - Spike's Tactical M16 Lightweight Nickel Boron Bolt Carrier Group, $250.00 (http://www.wingtactical.com/firearm-accessories/ar-15/upper-receiver-parts/bolts-carriers/spikes-tactical-m16-lightweight-nickel-boron-bolt-carrier-group/)

Wing Tactical - Spike's Tactical M16 Lightweight Nickel Boron Bolt Carrier Group, $250.00 (http://www.wingtactical.com/firearm-accessories/ar-15/upper-receiver-parts/bolts-carriers/spikes-tactical-m16-lightweight-nickel-boron-bolt-carrier-group/)

Black Rifle Syndicate announces the release of New 16-inch AR15 Complete Upper Receivers

Black Rifle Syndicate announces the release of New 16-inch AR15 Complete Upper Receivers

Left Handed Black Rain Ordnance Billet AR15 Upper Receiver - Black With Forward Assist And Dust Cover

Left Handed Black Rain Ordnance Billet AR15 Upper Receiver - Black With Forward Assist And Dust Cover

See how easy it is to build your own AR-15 upper receiver. Step-by-step with pictures, plus essential tools, recommended parts, tips/tricks, and two builds.

See how easy it is to build your own AR-15 upper receiver. Step-by-step with pictures, plus essential tools, recommended parts, tips/tricks, and two builds.

BCM 16" Mid Length Light Weight Upper Receiver Group with BCM KMR Handguard

BCM 16" Mid Length Light Weight Upper Receiver Group with BCM KMR Handguard