Carlson’s Hammer Expander (part no. 00113) is built for the Henry Big Boy centerfire lever rifle (post-2010), giving shooters extra leverage for a faster, easier cock stroke whether shooting off-hand or from a scoped rest. The knurled aluminum body slips over the factory hammer without permanent modification to the rifle.

Key Specifications

• Made from black hard-anodized aluminum for a durable, corrosion-resistant slip-on expander.
• Measures .375" in diameter and 1.5" in length once fitted to the hammer.
• Features a knurled body for a positive, non-slip cocking grip.
• Works for left- or right-hand shooters without a mirrored part.
• Balanced and lightweight to help prevent uneven wear on the trigger and sear surfaces.
• Compatible with Henry Big Boy rifles made after 2010.
• Made in the USA for consistent fit and finish.
• Can be used with or without a scope mounted over the action.
• Ships at roughly 0.1 lb, adding negligible weight to the rifle.

Frequently Asked Questions

Does this fit older Big Boy rifles? It is fitted for Henry Big Boy rifles manufactured after 2010.

Can this be used with a scope mounted? Yes, it is designed to work with or without a telescopic sight in place.

What is it made of? Black hard-anodized aluminum with a knurled grip surface.

Buy Carlson’s Hammer Expander for the Henry Big Boy

Order this hammer expander from our gun accessories and parts selection for faster, easier cocking on your Big Boy. Order it from our Lubbock, Texas gun shop for fast, insured shipping.