GunnyMack wrote: ↑Mon Jun 05, 2017 12:36 pm I can't find anything with your dimensions.
Are you sure it's 28 TPI?

Not exactly.
With my thread pitch gauge, none were a perfect match.
I tried 27 through 30 and twenty eight was the closest match.

Possibly metric?

Purchased a barrel as part of a lot at auction. Have Googled to no avail. No makers name on barrel (In the white). Caliber marked ".45 COLT" 20" in length. Ejector slot cut for top eject. Barrel diameter: .960" at chamber end. .640" at muzzle. Barrel threads: .780"x28 S...