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Anyone who has scoped a classic Marlin lever gun knows the problem right away. The optic sits low over the receiver and suddenly there is barely enough room to get a thumb on the hammer. This GrovTec hammer extension solves that by adding a horizontal spur that gives you noticeably more surface to press against, so you can cock and de-cock with confidence even when clearance is tight. It is machined from steel and wears a blued black finish that blends in nicely with the traditional look of these old rifles.
Fitment here is specific, and that is a good thing. This extension is made for the Marlin Model 36 produced from 1936 to 1947 and the Marlin Model 336 built from 1948 to 1956. GrovTec keeps each of their extensions matched to a particular hammer profile rather than selling a one-size unit, which is why you get a better mating surface. Because hammers from this era vary a little from gun to gun, some minor fitting may be needed to dial in a perfect seat, which is completely normal for parts made to work with vintage steel.
Setup is refreshingly simple. The extension secures with a small hex set screw that threads into the hollow end of the spur, and it can be mounted on the right or left side depending on your preference or your shooting hand. A quick tip from experience: the set screw hole sits centered and can be tough to spot, so a flashlight makes it easier to line up the screw on the first try. No gunsmithing appointment required for most folks.
At the end of the day this is one of those inexpensive upgrades that makes an older rifle far more pleasant to run with glass on top. More thumb purchase means faster, safer hammer manipulation in the field or at the range, and the steel construction means it will hold up as long as the rifle does. If you have got a well-loved early Marlin wearing a scope, this is the piece that brings the handling back.
This GTHM308 extension is made specifically for the Marlin Model 36 produced from 1936 to 1947 and the Marlin Model 336 built from 1948 to 1956. GrovTec matches each extension to a particular hammer profile, so it is not intended for later Marlin lever actions. If your 336 was made in 1957 or later, you would want a different GrovTec part number instead.
It attaches with a small hex set screw that threads into the hollow end of the extension using a 1/16 inch allen wrench. You slide it onto the hammer spur and snug the screw down, and it can be positioned on the right or left side. The set screw hole is centered and can be hard to see, so shining a flashlight in there helps you line it up on the first attempt.
For most scoped lever guns, yes, it makes a real difference. Low-mounted optics eat up the clearance you normally use to reach the hammer with your thumb, which makes cocking and de-cocking awkward. The extension adds a wider spur so you get solid thumb purchase without fighting the scope.
It is designed as a close-fit part, but because hammers from this era vary slightly from gun to gun, minor fitting is sometimes needed to seat it just right. That is normal for parts built to work with vintage rifles. A little careful filing or adjustment usually gets you a snug, secure fit.
| UPC | 811071013161 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GTHM308 |
| Color | Black |
| Length | 4.8000 |
| Model | |
| Product Type | Hammer Extension |
| Shipping Weight | 0.055 |
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