Selling a brand new never fired Criterion 20 inch 223 HBAR nitrided barrel. Comes with gas block, gas tube, and headspaced bolt for $300 shipped. Also selling a fde Bcm carrier group with it for an extra $100. Carrier and barrel have 0 rounds through them. Note this barrel is NOT chrome lined. Bought this stuff for a project that fell through. Venmo or Zelle only.