Strangler 12 Gauge Turkey Chokes
"Strangler chokes deliver the kind of performance that a “Serious Hunter” deserves to have. Extensive test results, have proven that Strangler delivers 30% Denser Patterns with up to 25% Better Penetration, than other choke tubes."
These chokes have a very unique internal geometry and are sought by collectors and shooters alike. I was able to find a small cache of them and have just a few in different thread types. They are made from 17-4PH stainless steel bar stock, and treated after manufacturing to assure the proper hardness level for all types of shot. These chokes are no longer made and have become harder and harder to find.