Henry Big Boy Mare’s Leg Side Gate 45 (Long) Colt 12.9in Polished Hardened Brass Lever Action Pistol – 5+1 Rounds

Frt 15 is a Houston, TX-based retailer specializing in firearms and accessories for families and responsible shooters. The Henry Big Boy Mare’s Leg Side Gate 45 (Long) Colt 12.9in Polished Hardened Brass Lever Action Pistol is a unique, hand-finished firearm that blends classic Western style with modern side-gate loading convenience. This isn’t your average lever gun; it’s a conversation piece built with American craftsmanship. We have it in stock and ready to ship today for $953.99.

Who Is This Henry Mare’s Leg For? (And Who Should Look Elsewhere)

Before we get into the brass and steel, let’s talk about who this firearm really speaks to. I see a lot of gear come through our shop, and pieces like this have a specific audience.

Buy it if: You’re a collector who appreciates American-made, historically-inspired firearms. You want a stunning display piece that’s also fully functional. You enjoy the tactile, mechanical satisfaction of a smooth lever action. You’re looking for a potent, short-range brush gun for hunting or ranch use where a full-length rifle is cumbersome. You value the versatility of the .45 Colt cartridge for both target shooting and defense.

Skip it if: You need a high-capacity, modern defensive pistol for everyday carry—this is a niche tool, not a Glock 19. You’re on a tight budget and see a firearm purely as a utility item. You’re a brand-new shooter looking for your first gun; the unique handling of a Mare’s Leg takes some practice. You prioritize lightweight polymer frames over heft and classic materials. If that’s the case, check out our modern pistols for more conventional options.

What Makes This Henry Big Boy Mare’s Leg Stand Out

I’ve handled my share of lever actions on range days and in the shop. When you pick up this Henry, you immediately feel the difference. It’s not just a cut-down rifle; it’s a purpose-built pistol with intention behind every detail.

1. The Polished Hardened Brass Receiver: This is the centerpiece. It’s not a thin plating or a cheap coating. This is solid, hardened brass that’s been meticulously polished by hand at Henry’s factory. It has a warm, substantial heft and a luster that synthetic finishes can’t replicate. It will develop a unique patina over time with honest use, telling its own story.
2. The Side Gate Loading System: This is a huge practical upgrade from traditional tube-loading-only lever guns. You can load rounds directly into the magazine tube via the side gate, or top off the tube without cycling the action. It’s a feature borrowed from the golden age of lever actions that adds real-world functionality, making reloads faster and more convenient.
3. American Black Walnut Furniture: The pistol grip and forend are cut from genuine American black walnut. The fit to the metal is excellent—no sharp edges or gaps. It provides a secure, organic feel in the hand that complements the cold metal, much like a well-fitted leather holster complements a trusted sidearm.
4. The .45 Colt Chambering: This is a classic, low-recoiling cartridge that’s incredibly versatile. From mild cowboy action loads to modern, hotter defensive rounds, the .45 Colt can do it all. It’s a pleasure to shoot, making this Mare’s Leg manageable and fun, not a punishing handful.
5. Mare’s Leg Configuration & Handling: With its 12.9-inch barrel, this firearm occupies a unique space. It’s more compact and maneuverable than any rifle, offering the ballistic advantage of a rifle cartridge in a package you can easily stow in a vehicle or carry on a sling. The lever action is smooth and positive right out of the box.

How It Stacks Up: Henry vs. The Competition

In my work, I compare parts and platforms daily. Let’s see how this Henry holds up against what else is out there in the lever-action pistol space.

The takeaway? The Henry offers a best-of-both-worlds scenario: the heritage, quality, and support of a major American manufacturer, with the unique configuration and premium features that justify its price over a basic import.

Henry Big Boy Mare’s Leg Side Gate 45 Colt: Detailed Specifications

The Honest Pros and Cons

Let’s break it down straight, like I would talking to a fellow shooter at the range.

Pros:

• ✅ Unmatched Craftsmanship: The hand-polished brass and fitted walnut set it apart. This is a showpiece.
• ✅ Practical Side Gate Loading: No fumbling with the tube under the barrel for every round. A genuine improvement in function.
• ✅ Manageable & Fun to Shoot: The .45 Colt in this platform has mild recoil, making for an enjoyable shooting experience.
• ✅ American-Made Reliability: Henry Repeating Arms has a stellar reputation for quality and stands behind their products.
• ✅ Unique & Versatile Platform: It’s a trail gun, a collector’s item, and a pure fun gun all in one.

Cons:

• ❌ Niche Application: This isn’t a do-everything firearm. It’s a specialist. If you need a primary defensive tool, look at our standard pistols.
• ❌ Weight & Bulk: At over 5.5 lbs, it’s substantially heavier than any polymer-frame pistol. It’s not meant for concealed carry.
• ❌ Premium Price: You’re paying for artistry and American labor. If the budget is the absolute top concern, there are less expensive firearms that go bang.

Your Questions, Answered