Primos 643 Jelly Head Turkey Choke Tube Remington Rem Choke 12 Gauge .665" ConstrictionJelly Head Choke Tubes from Primos are crafted with the most demanding turkey hunters in mind. This extralong extended choke is CNC milled from chrome alloy steel. They are designed to increase the range and pattern density of HeviShot, copper plated lead, or regular lead. The fluted ports allow gases to vent quickly behind the load of shot instead of blowing through it and causing pattern distortion. The ports also help reduce felt recoil and muzzle jump. These screwin turkey choke tubes have a knurled end, which extends beyond the end of the barrel for easy installation and removal without the use of any tools. Jelly Head Choke Tubes have a 90% pattern density at 40 yards. If you want to extend your effective range with your favorite Turkey shotgun or simply want to turn that old gobbler's head into jelly, this choke tube will do the job! SpecificationsMaterial: Chrome alloy steelGauge: 12Constriction: .665