Black, 9mm, 16" barrel assembly with 1/2"x28 muzzle threads. Includes barrel, barrel nut, and barrel nut clip (all factory installed). Looks like this: $150 cash (PayPal) plus shipping . . . 25% less than what I paid for the barrel assembly and having it threaded by Fred at CaR Firearms. Would trade for quality-brand red dot optic of equal value.