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

Hammer Extensions

Sale price$14.00
SKU: GTHM283
Select Your Hammer Extension:Henry Big Boy Centerfire Rifles, Post 2010 models & Henry Single Shot - GTHM283
Quantity:
warning

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 P65Warnings.ca.gov

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

Installs using a 1/16" hex/allen set screw that is 3/16" in length with 5-40 UNC-2B Threads. You insert the set screw in the hollow end of the hammer extension. TIP: The set screw hole is centered and but be hard to see, looking in with a quick flashlight can help center your set screw on install.

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.
    • 5 stars: 52 (80%)
    • 4 stars: 8 (12%)
    • 3 stars: 1 (2%)
    • 2 stars: 1 (2%)
    • 1 star: 3 (5%)
    R
    RICHARD TINGLER
    Needed a ham. ext. for a Lever Action Savage Revel DLX in .17HMR

    I needed a hammer extension for a Lever Action Savage Revel DLX in .17HMR and no one sells them. I finally found a chart showing different guns and the extensions with noted dimensions . Pict the closest larger size and IT FITS LIKE IT WAS MAKE FOR MY GUN! Works great and I love it!

    A
    Arthur Martinez
    Great company with great products.

    The customer service at GrovTec is top notch . I had some issues getting the right hammer extension for my lever action rifle and they were very helpful and made sure I got the right one after ordering the wrong one the first time. The part arrived quickly and fit my rifle perfectly. I highly recommend this company!

    A
    Anonymous
    Good as

    Good as ordered

    A
    Anonymous
    Not a great but sufficient

    Not a great fit but sufficient. The hammer extension has to be at the very rear end of the hammer spur to gain clearance for the bolt to retract.

    J
    J R T
    Excellent device with good fit

    Excellent device with good fit. Am using on Henry H-15 in 30-30 with scope. Be sure and use blue lock tight on very small allen screw and torque down to maximum extent with provided allen wrench. Device did come off hammer after 125 rounds but reinstalling with blue lock tight and maximum torque should secure device.

    J
    James Shultz
    came nowhere near fitting this rifle

    came nowhere near fitting this rifle.

    A
    Anonymous
    1951 Marlin 336 SC

    Very pleased, fits my Marlin 336 flawlessly!

    D
    David Coates
    Great product, ya gotta do a little filing, after

    Great product, ya gotta do a little filing, after a perfect tight fit.

    M
    Mason Smith
    Nice piece

    Nice piece. Starting of the threads was pretty rough and I was worried about cross threading but it was just the first mil or so.

    T
    Tony Vaitkevicius
    A couple weeks ago I ordered a Hammer Extension

    A couple weeks ago I ordered a Hammer Extension for my Marlin model 36-A .30 .30 through Amazon. The set screw would not thread through the extention piece. I sent the company an email asking if this was a common issue and they had a replied within 5 minutes. They stated it was a known issue. The locktight applied to the screw would harden and prevent it from threading. They IMMEDIATELY sent out a new one, no charge, and I had it in 2 days. It is SO RARE to find such customer service these days. So, Thank for the professionalism. It was redreshing and you have another loyal customer for future needs.

    A
    Allen Harper
    Does not fit right on Winchester 94/22

    Does not fit right on Winchester 94/22. The rifle will not function with this installed on the hammer. It is too big.

    A
    Anonymous
    Thanks, perfect

    Thanks, perfect fit!

    B
    Brian
    Great product works as it should easy

    Great product works as it should easy installation

    D
    David S
    Good product, excellent service.

    I needed a hammer extension for a Savage Revel. I was having trouble finding one but finally found something that said the same one for Henry lever and pump guns would work. I ordered one directly from Grovtec and received it in very short order. In trying to install it, the attachment screw would not tighten down to hold the extension in place. I contacted Grovtec to explain the problem. Within a couple hours I had a response. I was advised that the problem was due to the locking compound applied to the screws had hardened to the point it would not allow the screw to be tightened all the way. I was given the option of trying to clean the screws or having new ones sent to me without the locking compound. I initially requested new screws but decided I would try cleaning the original ones. I was able to clean the screws enough (with a good bit of effort) that I was able to tighten the screw all the way to lock it onto the hammer. It was a good secure fit with no issues of the bolt hitting the extension or the extension contacting the stock. I then contacted Grovtec and cancelled the order for new screws. Overall, I am very pleased with the product and extremely well pleased with the customer service after the fact.

    H
    Henry Shotgun
    The hammer extension worked great on my Henry

    The hammer extension worked great on my Henry Shotgun. Fit and workmanship great. Turkey season is around the corner, so I'll be able to test in the field.

    R
    RIck. Campbell
    I got 2 for my Tikka m07 over-under combination

    I got 2 for my Tikka m07 over-under combination gun they fit without any grinding on the inside .Would highly recommend 5 stars

    L
    Lawrence Sacharski

    very good products, fit well on my hammers.

    T
    Thomas Gantt

    Marlin 336. This works great. I like it better than the original flat one that was on it.

    W
    Wayne Wilson
    Excellent Hammer Extension

    I needed a hammer extension for a 1954 Marlin 336. Grovetec is the only company that makes one. I have used a number of Grovetec products and have been very impressed with all of them. This hammer extension is no different, quality and fit are both excellent. Plus it is made in USA.

    R
    Roger MofflerCustomer
    Hammer spur

    Found this company online and I'm glad I did. Purchased hammer spur for my lever rifle. Great price, easy install, great quality product. Worked great and made my rifle safer to handle which is very imporrtant to me. Keep up the good work guys
    Thanks, Roger

    I
    Isaac Fritz
    Adds safety to the weapon by providing control over the hammer.

    Provides safety by adding control over the hammer. Definitely enhances the weapon

    E
    Edward C Harris

    The hammer extension fit as described. It looks like standard equipment on the BL22. Ordering was easy, and the extension was delivered promptly. I appreciate the extra set screw that was included in the package. If you need this or a similar product, I strongly recommend Grovtec.

    T
    Texas Vince
    Great Products!

    You filled the void for this type of product. Thanks for what you do.

    G
    Glenn Bevin
    machined, not cast

    The hammer extension will require some filing in order to fit the hammer on the '92. It is well made and it appears to be machined, not cast. I think it is worth the expense.

    S
    SM
    Henry Hammer extension

    Fits my Henry H010 perfectly. Excellent.

    E
    Eric Holland
    Excellent product

    These hammer extensions should come with every Henry rifle.

    E
    E.J. Trucks
    GTHM277 on Rossi .357 single shot.

    Measured hammer on the Rossi and GTHM277 fits perfectly, with a bit of work with a needle file.

    L
    Lamont Register

    Hammer extension fits perfectly. Thank you all for making the right piece for my 1971 444s Marlin.

    M
    Martin Makowski
    Works Well on Henry

    Good quality, just what I needed to cock the hammer with glove on. Safer too.

    D
    Denim Butler
    Excellent service

    I had ordered the wrong item and when I called back to get advice on the size of hammer extension I should get, the sales rep was extremely helpful and excellent to work with. Thank you

    A
    Anonymous
    H015 extender

    I bought a hammer extension for my H015 Henry single shot.Purchase was made because I felt the hammer would be difficult to operate with gloves on.This is a high quality addition to a great little rifle.

    N
    Nathan H.
    Good product, good support.

    After a mistaken order, I was impressed by the support team's willingness to help me out. After all is said and done, I have a nice new part on an old firearm which makes it a joy to shoot again with an optic.