GrovTec GTHM283 Hammer Extension Henry Big Boy, Single Shot Black Steel

The GrovTec GTHM283 Hammer Extension is a purpose-built accessory designed to give Henry Big Boy centerfire rifles (post-2010) and Henry Single Shot rifles a much larger hammer contact surface. Machined from steel and finished in a low-glare black coating, this horizontal-mount extension replaces the factory hammer spur to deliver easy cocking and improved thumb purchase whether you shoot with gloves on or off.

Drop-in installation requires no permanent modification to the host rifle. The extension can be mounted on either the right or left side of the hammer, allowing the shooter to choose the orientation that best matches their grip and shooting style. Like all GrovTec hammer extensions, the GTHM283 is specific to the firearm it fits - confirm your Henry Big Boy is a post-2010 centerfire model, or that you are installing it on a Henry Single Shot, before use.

Whether you run a Henry Big Boy in the field, on the range, or as a working cowboy-action lever rifle, the GTHM283 gives the factory hammer a noticeably larger, more positive surface to thumb - reducing slips and speeding up follow-up cocking cycles.