Description
Back when Westerns ruled the TV dial, Steve McQueen carried a chopped down lever gun that stole every scene it was in. The Henry Big Boy Mare's Leg is that idea done right, built in the USA with the same fit and finish Henry puts into its full size rifles. You get a 12.9 inch octagon blued steel barrel, a polished hardened brass receiver that catches the light just so, and select American walnut furniture capped with a brass buttplate. At 25 inches overall and about 5.79 pounds, it holsters like a pistol but cycles with all the speed of a lever action.
Running the Big Boy Mare's Leg at the Range
The large loop lever is the star of the show here, and paired with Henry's famously crisp action it makes fast follow-up shots feel natural. Chambered in .45 Colt with a five round tubular magazine, it feeds that classic big bore cartridge smoothly whether you're plinking steel, punching paper, or shooting cowboy action matches. Sights are a brass bead up front and a fully adjustable semi-buckhorn rear with a diamond insert, a setup that looks period correct and dials in nicely once you spend a little time with it. A transfer bar safety rounds out the package.
Side Gate Loading, Henry Style
This version gives you the best of both worlds when it comes to feeding the gun. There's a side loading gate on the receiver so you can top off the magazine on the fly, plus Henry's removable magazine tube, which makes unloading at the end of the day quick and painless. It's a small detail that makes a real difference in how easy this gun is to live with.
Why the Mare's Leg Earns Its Spot
Some guns are pure practicality and some are pure fun, and this one leans hard into the fun column while still being a well built, accurate shooter. Whether it ends up in a display case, a cowboy rig, or your regular range rotation, the Mare's Leg is the kind of gun that draws a crowd every time it comes out of the bag.
Key Specifications
- Manufacturer: Henry Repeating Arms
- Model: Big Boy Mare's Leg Side Gate
- MPN: H006GCML
- UPC: 619835060754
- Caliber: .45 Colt
- Action: Lever Action
- Capacity: 5 Rounds, Tubular Magazine
- Barrel Length: 12.9"
- Barrel Type: Octagon, Blued Steel
- Rate of Twist: 1:16
- Receiver Finish: Polished Hardened Brass
- Stock: American Walnut with Brass Buttplate
- Front Sight: Brass Bead
- Rear Sight: Fully Adjustable Semi-Buckhorn with Diamond Insert
- Overall Length: 25"
- Weight: 5.79 lbs
What’s Included
- Henry Big Boy Mare's Leg lever action pistol
- Owner's manual
Frequently Asked Questions
How do you load the Henry Mare's Leg?
You've got two options with this Side Gate model. There's a loading gate on the right side of the brass receiver so you can top off the five round tube magazine without breaking anything down, and Henry also kept the removable magazine tube, which makes unloading at the end of a range session quick and safe. It's a genuinely handy combination you won't find on a lot of lever guns.
Can the Mare's Leg in .45 Colt also shoot .410 shotshells?
No. This gun is chambered strictly for .45 Colt, and the chamber and bore are not designed to handle .410 shells. Firearms that shoot both cartridges are purpose built with different chambers and bores, so stick with quality .45 Colt ammunition in this one.
Is the Henry Big Boy Mare's Leg based on the gun from the old TV Western?
It is. The Mare's Leg concept comes from the cut-down lever gun Steve McQueen carried in the 1950s series Wanted: Dead or Alive, and Henry builds this version with the walnut stock cut to the specification of that famous TV gun. The large loop lever completes the look.
Are the sights on the Mare's Leg adjustable?
Yes. The rear sight is a fully adjustable semi-buckhorn with a diamond insert, paired with a brass bead front sight. It takes a little time behind the gun to get used to the shorter sight radius compared to a full rifle, but once dialed in it shoots better than most people expect from a lever action this compact.





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