Wanting to trade my 18" barrel for a 16" (might consider 14.5"). Barrel is unfired but was mocked up on an Armalite and CMMG upper. Comes with .936" low pro gas block and tube. Specs below in link to CMMG. Prefer SS medium or lightweight. Can include A2 style FH and crush washer if your trade comes with a muzzle device already installed. Ok with low mileage used. Best method for contact is email gunnergirl81 at gmail. Thanks guys!