mrm33533k5Proof Research 16" Carbon 6mm ARC AR-15 Barrel (Brand New) + Superlative Arms AGB & Tube Up for sale is a brand new, never-installed Proof Research 16" Carbon Fiber AR-15 barrel chambered in 6mm ARC. This is a factory replacement barrel directly from Proof Research. The turnaround took long enough that I pivoted to a different setup for the season while waiting on fulfillment. Now that it’s in hand, it’s fresh out of the packaging and ready for a new home. Included: - Proof Research 16" 6mm ARC Carbon AR-15 barrel (Brand new / unfired) - Superlative Arms adjustable gas block (.750") & rifle-length gas tube (Lightly used, under 100 rounds) Payment: Venmo or Zelle preferred. Ships promptly with tracking. Not interested in trades at this time. Feel free to reach out with any questions. Specs from Proof below: - Part #: 128657 - UPC: 843068128657 - Cartridge: 6mm ARC (Advanced Rifle Cartridge) - Length: 16" - Twist: 1:7.5 - Muzzle Threads: 5/8"-24 - Gas System: Rifle-length - Gas Block Journal: .750" - Feed Ramps: M4
