GTHM68, GTHM69, GTHM70, GTHM71, GTHM72, GTHM73, GTHM74, GTHM79, GTHM277, GTHM283, GTHM284, GTHM285, GTHM308

Hammer Extensions

Sale price$13.00
Select Your Hammer Extension:Browning BL-22. Astra 357 - GTHM71

WARNING: Some of these products can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

13 different 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. 

Note: Select the correct Hammer Extension for your firearm in the drop down menu above.

We do not recommend the use of our hammer extensions for applications not listed.


  • GTHM-68 | Winchester 94s and Big Bore 94s including angle-eject (except 94/22) . Ithaca X-caliber
  • GTHM-69 |Winchester 94/22
  • GTHM-70 | Marlin Lever Actions 1957-1982
  • GTHM-71 | Browning BL-22, Astra 357
  • GTHM-72 | Ruger Blackhawk, H&R Topper, New England Firearms Handi Rifle
  • GTHM-73 | Browning BLR 1981-1991.  Does not fit 1992 & later models.  Not for use on folding hammers. Ithaca Tikka 12-70 over/under.
  • GTHM-74 | All Marlin Lever Actions made in 1983 & later including 39A, 39M, 1894, 1894C, 1895S, 336C, 336T, 375, 444S, Glenfield 30A
  • GTHM-79 | T/C Contender, S&W Model 29 (NOT FOR T/C G2 Contender)
  • GTHM-277 | Henry Big Boy, Pre 2010 models
  • GTHM-283 | Henry Single Shot, Henry Big Boy Centerfire Rifles, Post 2010 models
  • GTHM-284 | Henry 22 Pump and Lever Action rimfire rifles
  • GTHM-285 | Browning BLR 1992 -1995 Not for use on folding hammers.
  • GTHM-308 Model 36 Marlin (1936-1947) and Marlin 336 (1948-1956)

Customer Reviews

Based on 13 reviews
Ben Thompson
Great Customer service

I purchased an hammer extension for my BLR from a retailer and the package was mislabeled. The extension wasn't the correct one for the BLR. After verifying dimensions Grovtec send a replacement out right away. This is the third firearm that has one of their hammer extensions.

Browning BL-22

Awesome product. Great fit to the hammer. Easy access to the hammer after mounting a scope to my Browning BL - 22

Mike Ewbank
Solid and Comt

Have used this steel extension for many years and they never work loose. Bought the last one to replace the flat, glossy aluminum extension with the sharp corner that came on the rifle.

Timothy Hamil
Winchester hammer extension review

Ordered for winchester 94 22 ,fit was perfect and install was easy .

Rick Z
Marlin Hammer Extension

The extension that was ordered was supposed to fit a 1970's Marlin 336 hammer spit, but it did not fit and was to small. Not worth my time and effort sending it back.

Hello Rick, we're sorry that this hammer extension didn't fit. I went ahead a refunded the cost of the part you ordered. Just as a reminder, all our our hammer extenstions say 'minor fitting may be required'. We would love to know how far off the dimensions were? As you can imagine, it's a difficult task to fit every single hammer on the market and we're constantly gathering more data and feedback on how we can better serve our customers.