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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
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
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 ...
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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...
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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...
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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
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Product Info for GrovTec US Hammer Extensions

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

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

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 Henry Single Shot Hammer Extensions, Black, GTHM283, EDEMO1, Condition Parts Only/Salvage, Defective , MPN: GTHM283-EDEMO1 , Code: 8Z-HMS-GTHMREX2-GTHM283-EDEMO-DF-F
  • 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
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