GrovTec Made In USA Hammer Extensions
HGTHM-284 fits all Henry .22s rimfire H001/H003/H004 series
Please note that the Henry Big Boy was recently updated. This
hammer extension will fit on the new version. It will look like this.
HGTHM-283 fits all Henry centerfire H006/H009/H010 series
If your Henry Big Boy has the old style hammer, as pictured here, call
customer service at 866-200-2354 as you will need to obtain the new