SKU: 55474138631

GROVTEC HAMMER EXTENSION

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Description

GROVTEC HAMMER EXTENSION13 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. Select the correct Hammer Extension for your firearm in menu above. We do not recommend the use of our hammer extensions for applications not listed. PART # FIREARMS FIT Hammer Slot Dimensions (W x H) GTHM68 Winchester 94s and Big Bore 94s including angle eject (except 94 22)

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. 

Select the correct Hammer Extension for your firearm in menu above. 

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

 

PART #

FIREARMS FIT

Hammer Slot Dimensions (W x H)

GTHM68

Winchester 94s and Big Bore 94s including angle-eject (except 94/22) and Ithaca X-caliber - 

0.360" x 0.139"

GTHM69

Winchester 94/22

0.315" x 0.125"

GTHM70

Marlin Lever Actions 1957-1982

0.320" x 0.094"

GTHM71

Browning BL-22, Astra 357

0.365" x 0.235"

GTHM72

Ruger Blackhawk, H&R Topper, New England Firearms Handi Rifle

0.315" x  0.238"

GTHM73

Browning BLR 1981-1991.  Does not fit 1992 & later models.  Not for use on folding hammers. Ithaca Tikka 12-70 over/under.

0.555" x  0.190"

GTHM74

All Marlin Lever Actions made in 1983 & later including 39A, 39M, 1894, 1894C, 1895S, 336C, 336T, 375, 444S, Glenfield 30A

0.375" x  0.094"

GTHM79

T/C Contender and S&W Model 29 (DOES NOT FIT T/C G2 Contender)

0.500" x  0.190"

GTHM277

Henry Big Boy, Pre 2010 models

0.300" x  0.187"

GTHM283

Henry Single Shot, Henry Big Boy Centerfire Rifles, Post 2010 models

0.306" x  0.109"

GTHM284

Henry 22 Pump and Lever Action rimfire rifles & Rossi 92/22 & Savage Revel .22

0.355" x  0.160"

GTHM285

Browning BLR 1992 -1995 Not for use on folding hammers.

0.630" x  0.208"

GTHM308

Model 36 Marlin (1936-1947) and Marlin 336 (1948-1956)

0.285" x  0.159"

 

 

 

NOTE: MINOR FITTING MAY BE REQUIRED - Not all hammers are made to exact tolerances. Sometimes you may need to lightly file the opening of your grovtec hammer extension to assure a secure fit. We recommend using a small metal file. You can also use some liquid bluing to re-coat the bare metal if necessary.

 

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 55474138631

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4.7 ★★★★★
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K
Verified Purchase
Kevin Boynton
Omaha, US
★★★★★ 5
Works
Fit my 1996 xr6 150 just fine. Engine runs at correct temperature so they are working as they should.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 13, 2026
C
Verified Purchase
Champ
Lake Worth, US
★★★★★ 5
Quick delivery
Fit like they should and seems to be working great
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Reviewed in the United States on March 15, 2026
G
Verified Purchase
GINGER B.
Birmingham, US
★★★★★ 5
Great product
Great product
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Reviewed in the United States on December 30, 2025
C
Verified Purchase
chris s
Lake Worth, US
★★★★★ 5
Fit Mercury 150 saltwater 2 stroke great!
These fit my Mercury 150 perfect. Took it out for a test run and engine ran great with no overheating issues.
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Reviewed in the United States on August 26, 2025
R
Verified Purchase
Robert Werkhoven
New York, US
★★★★★ 5
Work’s okay
They work ok, as expected
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Reviewed in the United States on August 26, 2025

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