Automag ACI Zero gravity barrel, good shape, silk screen is wearing off, roughly 12 inch.Twistlock barrels require a wire or a plastic detent. Please see photos to see them. Some barrels have them included and some do not. Most included orings will need to be replace. If a wire / plastic twistlock detent is included it's likely okay but may need to be replaced at some point in the future. Stainless back of bore look good, front half that is anodized doesn't have the best pre ano finish.
