Name: GrovTec US Hammer Extensions
Brand: GrovTec US
SKU: 8Z-HMS-GTHMREX2
Price: 13.29 USD
Availability: InStock
Rating: 4.3 (14 reviews)

GrovTec US Hammer Extensions

Government Export Restriction

This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.

Questions & Answers

Which model do I need for a Henry 45-70 side gate? Expert Answer

The GrovTec US Hammer Extensions for the Henry Big Boy will work for the Henry 45-70 Side Gate.

by Hunter, Gear Expert, March 27, 2023

Would any of your hammer extensions fit a Winchester 62A pump? If it has a too large of an opening, I could fill it in w/ epoxy so that it fits. Expert Answer

There is not a specific model GrovTec US Hammer Extension for the Winchester 62A.

by Hunter, Gear Expert, May 23, 2023

View All Q&A You Have a Question? Ask!

Customer Reviews

Helpful Positive Review

Fits Henry 45-70 by dwingit, Verified Owner, February 17, 2018

This hammer extension fit my Henry 45-70 perfectly. It makes the use of a scope on a lever action easier to access the hammer without having to worry about fumbling for it under the scope. It made shooting my rifle a much smoother process.

1/1 found this helpful

Helpful Negative Review

Could have been mispackaged, but not the right product by Drew, Verified Owner, December 22, 2016

Got this GTHM-284 model which is supposed to be for Henry lever action Rimfires. Was for a Henry youth model lever action .22lr. Packaging of the product is correct, but the space where the hammer fits is a good 1.5 times too wide. Like something ...
Read More...

1/1 found this helpful

Most Recent Reviews

Solid upgrade by JerryFromOttawa, Verified Owner, April 11, 2026

This hammer extension was a nice little upgrade to the Henry model X I own in .357. It seemed awkward in the photos, but once installing I found the extension to allow much more ergonomic manipulation of the hammer. On this rifle, hammer control is...
Read More...

Most Recent Reviews

simple and convenient BL-22 accessory. by MCD, Verified Owner, February 5, 2026

Very useful to operate the hammer, especially if you have a scope on the Browning BL-22 rimfire. No more pinching your finger, also releasing the hammer is much safer with it. Even without a scope still makes îți easier to operate the hammer.

Most Recent Reviews

Henry .22 Hammer Extension by JP, Verified Owner, July 21, 2024

I use the hammer extension on a H001 Henry .22 lever action. It makes it possible to work the hammer when a scope is installed on the rifle, making operation much safer if decocking on a loaded chamber. The only issue I have is that the back of the b...
Read More...

Most Recent Reviews

Hammer Extension by Robert, Verified Owner, April 3, 2024

The extension fitment is good and seems to be well built. It provided the additional scope clearance needed for hammer cocking and de-cocking.

Read All 14 Reviews

Expert Advice Request for Quote Price Match

Compare

Product Info for GrovTec US Hammer Extensions

Hammer extensions to fit your firearm with an exposed hammer after you mount a scope.

Note: Due to the varying dimensions of hammers, minor fitting may be required.

WARNING: California`s Proposition 65

Specifications for GrovTec US Hammer Extensions:

Manufacturer:	GrovTec US
Color:	Black
Fabric/Material:	Steel
Condition:	New

Package Contents:

GrovTec US Hammer Extensions

What firearm models does the manufacturer say GrovTec US Hammer Extensions is compatible with?

The manufacturer says that GrovTec US Hammer Extensions is compatible with Marlin Model 375, Marlin Model 36, Marlin Model 336, Marlin Model 62, Marlin Model 57, Marlin Model 57M, Marlin Model 444, Smith & Wesson Model 29 N-Frame Revolver, Thompson/Center Contender, Marlin Glenfield Model 30A, Marlin Model 1984C, Marlin Model 1895S, Marlin Model 444S, Winchester Model 1894, Marlin Model Golden 39A, Henry Single Shot, Winchester Model 1894 Angle Eject, Winchester Model 1894 Big Bore, Ithaca X-Caliber, Henry Big Boy

Compare

GrovTec US Hammer Extensions Orderable Models

List of Orderable Models

GrovTec US Hammer Ext - Henry Big Boy, GTHM283 , MPN: GTHM283 , UPC: 811071012836 , Code: 8Z-HMS-GTHMREX2-GTHM283
GrovTec US Hammer Ext - Ruger Blackhawk, H & R Topper, New England Firearms Handi Rifle, GTHM72 , MPN: GTHM72 , UPC: 895474001727 , Code: 8Z-HMS-GTHMREX2-GTHM72
GrovTec US Hammer Ext - Thompson Center Contender, S&W Model 29, GTHM79 , MPN: GTHM79 , UPC: 895474001796 , Code: 8Z-HMS-GTHMREX2-GTHM79
GrovTec US Hammer Ext - Henry Big Boy, Older Pre 2010 Centerfire Rifles, GTHM277 , MPN: GTHM277 , UPC: 811071012775 , Code: 8Z-HMS-GTHMREX2-GTHM277
GrovTec US Hammer Ext - All Marlin Lever Actions made in 1983 or later, GTHM74 , MPN: GTHM74 , UPC: 895474001741 , Code: 8Z-HMS-GTHMREX2-GTHM74
GrovTec US Hammer Ext - Winchester 94s and Big Bore 94s, Ithaca X-Caliber, GTHM68 , MPN: GTHM68 , UPC: 895474001680 , Code: 8Z-HMS-GTHMREX2-GTHM68
GrovTec US Hammer Ext - Marlin lever actions 1957-1982., GTHM70 , MPN: GTHM70 , UPC: 895474001703 , Code: 8Z-HMS-GTHMREX2-GTHM70
GrovTec US Hammer Ext - Henry 22/Mag, GTHM284 , MPN: GTHM284 , UPC: 811071012843 , Code: 8Z-HMS-GTHMREX2-GTHM284
GrovTec US Hammer Ext - Browning BLR 1981-1991. Will not fit 1992 and later models, GTHM73 , MPN: GTHM73 , UPC: 895474001734 , Code: 8Z-HMS-GTHMREX2-GTHM73
GrovTec US Hammer Ext - Browning BL-22, Astra 357, GTHM71 , MPN: GTHM71 , UPC: 895474001710 , Code: 8Z-HMS-GTHMREX2-GTHM71
GrovTec US Hammer Ext - Browning BLR 92, GTHM285 , MPN: GTHM285 , UPC: 811071012850 , Code: 8Z-HMS-GTHMREX2-GTHM285
GrovTec US Hammer Ext - Winchester 94/22., GTHM69 , MPN: GTHM69 , UPC: 895474001697 , Code: 8Z-HMS-GTHMREX2-GTHM69
GrovTec US Hammer Ext - Model 36 marlin 1936-1947 and Marlin 336 1948-1956, GTHM308 , MPN: GTHM308 , UPC: 811071013161 , Code: 8Z-HMS-GTHMREX2-GTHM308

GrovTec US Hammer Extensions Unavailable & Discontinued Models

List of Unorderable Models

USED GrovTec US T/C Contender/S&W Model 29 Hammer Extensions, Black, GTHM79, EDEMO1, Condition Parts Only/Salvage, Wrong Product , MPN: GTHM79-EDEMO1 , Code: 8Z-HMS-GTHMREX2-GTHM79-EDEMO-WP-F
USED GrovTec US Henry Single Shot Hammer Extensions, Black, GTHM283, EDEMO1, Condition Parts Only/Salvage, Defective , MPN: GTHM283-EDEMO1 , Code: 8Z-HMS-GTHMREX2-GTHM283-EDEMO-DF-F

Compare (0)

More Deals

GrovTec US Hammer Extensions Up to 33% Off — 13 models

Product Info for GrovTec US Hammer Extensions

Specifications for GrovTec US Hammer Extensions:

Package Contents:

What firearm models does the manufacturer say GrovTec US Hammer Extensions is compatible with?

GrovTec US Hammer Extensions Orderable Models

List of Orderable Models

GrovTec US Hammer Extensions Unavailable & Discontinued Models

List of Unorderable Models

FREE SHIPPING on Over 250,000 Products

Enjoy our FREE RETURNS

More Deals

GrovTec US Hammer Extensions Up to 33% Off — 13 models

Product Info for GrovTec US Hammer Extensions

Specifications for GrovTec US Hammer Extensions:

Package Contents:

What firearm models does the manufacturer say GrovTec US Hammer Extensions is compatible with?

GrovTec US Hammer Extensions Orderable Models

List of Orderable Models

GrovTec US Hammer Extensions Unavailable & Discontinued Models

List of Unorderable Models