Description
Mount a scope on a hammer-fired lever gun or single shot and you run into the same headache every time: the rear bell of the optic sits right where your thumb needs to go. Carlson's Universal Hammer Expander fixes that by shifting your cocking point out to the side, giving you a wider, knurled landing pad that's easy to grab whether you're bare-handed or running gloves. It works for left- or right-handed shooting since you can mount it on either side of the spur.
The body is machined from aluminum and finished in a hard-coat black anodize, measuring .375 inches in diameter and 1.5 inches long. It's balanced and light enough that it won't throw off your hammer's feel or add meaningful weight where it counts. Because it clamps onto the hammer spur itself and not the trigger or sear group, it also helps keep wear even across those internal surfaces over time.
Why the Carlson's Hammer Expander Earns Its Spot
The knurled surface is the real selling point here. It gives you positive, non-slip contact when you're thumbing the hammer back or letting it down easy, which matters a lot when your fingers are cold or wet. It plays nice with or without a scope, so plenty of folks add one just to make an old muzzleloader or single-shot easier to operate.
Fitting the Carlson's Universal Expander
Installation is about as simple as it gets. Back the set screw out with the included hex wrench, slide the expander over your hammer spur on whichever side suits your grip, then snug the screw down hand-tight. A dab of blue thread locker on the set screw is a smart move, especially on harder-kicking chamberings where recoil can slowly back small hardware out. This one is built to fit all T/C Contenders and most exposed-hammer rifles, shotguns, and handguns, and like the rest of Carlson's lineup, it's made in the USA.
Key Specifications
- Manufacturer: Carlson's Choke Tubes
- Manufacturer Part Number: 00110
- UPC: 723189001100
- Product Type: Hammer Extension
- Material: Aluminum
- Finish: Black Hard Anodized
- Diameter: 0.375 in.
- Length: 1.5 in.
- Hand: Ambidextrous
- Hammer Type: Exposed
- Fitment: All T/C Contenders and most exposed-hammer firearms
- Country of Origin: Made in USA
What’s Included
- Carlson's Universal Hammer Expander (black anodized)
- Set screw
- Hex/Allen wrench
Frequently Asked Questions
Will the Carlson's Universal Hammer Expander fit my rifle?
It's designed to fit all T/C Contenders along with most exposed-hammer rifles, shotguns, and handguns. Because hammer spurs vary a little from gun to gun, a minor bit of fitting is occasionally needed to get a snug seat. The hammer slot on this model runs roughly .508 inches wide and .190 inches high, which covers a wide range of common exposed hammers.
How does the hammer expander install?
Back the set screw out with the included hex wrench, slide the expander over your hammer spur on the side that matches how you shoot, then tighten the screw down hand-tight. No drilling or permanent alteration is involved, so you can remove it later if you pull your scope and go back to irons. Many folks add a drop of blue thread locker to keep the small set screw from backing out under recoil.
Does this hammer extension slow down lock time or affect the trigger?
It clamps onto the hammer spur itself, not the trigger or sear assembly, so it doesn't touch your trigger mechanics. The aluminum build keeps added weight to a minimum, which is why it's marketed as balanced and lightweight. Some shooters prefer to keep extension weight low on very fast lock-time setups, but for the vast majority of hunting and range use the difference is negligible.
Can left-handed shooters use the Carlson's Hammer Expander?
Yes, it's fully ambidextrous. You simply mount it on whichever side of the hammer suits your grip, so it works equally well for left- or right-handed use. The knurled body gives you positive, non-slip contact from either direction.




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