JK BALD EAGLE 12GA is a Choke Replacement Muzzle Device (CRMD) it can be used as a stand-alone muzzle device or along with our 195 series compensators and suppressors. Features Installs in place of standard choke tube. Designed as a gas-sealing QD mount for our JK 195 series of 12 gauge shotgun suppressors and 195 LT SUPER Comp. Can also be used as a stand-along muzzle device. Cylinder bore choke is the system for controlling shot pattern restriction and is located in the end cap of 195 suppressors. Therefore, CRMD can remain installed while the Choke Cap is easily swapped in seconds with no specialized tools required Specifications Overall Length: OAL 2.9" Internal Choke Length: 1.48" Thread: 13/16-32 tpi