This is a Uncle Mike's Hammer Ext, model 2450-0.
This hammer extension fits the Winchester 94s and Big Bore 94s including Angle-Eject (except 94/22)" lthaca X-Caliber" Henry Lever Action .22 & Pump Action .22
Features:
Blued Steel
Knurled Surface
Allen Wrench Included
Fits Right or Left Side