Optima hp choke tubes have manufactured barrels with several different threads/choke styles over the years. Barrels that use the mobil choke will typically be marked only with the gauge marking. It will be marked optima chokes.
Optima hp choke tubes have manufactured barrels with several different threads/choke styles over the years. Barrels that use the mobil choke will typically be marked only with the gauge marking. It will be marked optima chokes.