Trulock Tru-Choke SD Precision Hunter 12 Ga Improved Cylinder Ported. This choke tube by Trulock is essential when you want to create a design in your muzzle. The TruLock Tru Choke S.D. Precision Hunter Choke Tube was professionally designed and manufactured by professionals who know exactly what you need and want out of your tools. When you're doing changes on your firearm you want to make sure you have something reliable; you want to make sure you have Tru Lock True Choke SD Precision Hunter Choke Tube. Specifications for Trulock Tru-Choke SD Precision Hunter Choke Tube: Manufacturer: Trulock Gauge: 12 Choke Tube System: Tru-Choke Package Contents: Trulock Tru-Choke SD Precision Hunter Choke Tube Trulock PHSD12720P: Tru-Choke SD Precision Hunter 12 Ga Improved Cylinder Ported