The Henry Big Boy Carbine Side Gate is a lever-action rifle chambered in .44 Magnum/.44 Special with a large loop lever and side gate loading system. 
 

Key Specifications 

• Model Number: H012GR 
• Action Type: Lever Action Large Loop 
• Caliber: .44 Magnum / .44 Spl 
• Capacity: 7 Rounds (+1) 
• Barrel Length: 16.5 inches 
• Overall Length: 34 inches 
• Weight: 6.59 lbs. 
• Stock Material: American Walnut with Blued Finish 
• Safety Feature: Transfer Bar Safety Mechanism 
• Sights: 
  • Rear Sight: Fully Adjustable Semi-Buckhorn w/ Diamond Insert 
  • Front Sight: Brass Bead 
     

Detailed Features 

1. Lever Action Mechanism: The large loop lever allows quick cycling and follow-up shots. The action is smooth enough that it does not require deliberate effort to cycle under normal use. 
    
2. Side Gate Loading System: Cartridges load directly through the side gate while keeping the magazine tube loaded. This avoids the need to load through the muzzle-end of the tube, which speeds reloading considerably. 
    
3. American Walnut Stock: The walnut stock contributes to recoil absorption and provides a traditional grip feel. The blued finish on the metal is paired with the walnut for a classic look. 
    
4. Blued Steel Construction: The blued finish requires some maintenance to stay clean of surface rust in wet conditions, though the underlying steel construction is durable. 
    
5. Adjustable Sights with Brass Bead Front: The semi-buckhorn rear sight adjusts for elevation, and the brass bead front gives good contrast for target acquisition in daylight. 
    

Target Audience 

The carbine length (16.5-inch barrel, 34-inch overall) makes this easier to handle in tight spaces than the full-length Big Boy. At 6.59 lbs it is manageable for most shooters. Hunters using .44 Magnum for deer-sized game and sport shooters who enjoy lever-action platforms are the primary audience. 
 

Usage Scenarios 

• Hunting medium and large game at moderate distances where the .44 Magnum caliber is appropriate. 

The Henry Big Boy Carbine in .44 Mag with side gate gets strong feedback from both lever-action enthusiasts and practical shooters. The smooth lever action is a consistent positive, with owners describing it as one of the better factory-smooth actions available at this price point.

The side gate loading system gets specific praise. Users who have shot traditional tube-loaded lever rifles note the difference in reload speed and convenience, particularly for hunting where a quick load is occasionally needed. The walnut stock and blued finish attract users who appreciate a traditional aesthetic, and build quality comments are generally positive.

Accuracy at practical hunting ranges and manageable recoil are recurring themes. At 6.59 lbs the carbine absorbs the .44 Magnum recoil better than a lighter rifle would, and most users describe it as comfortable to shoot even with full-power Magnum loads.

The most common criticisms are weight during extended carry and price relative to other lever-action carbines. Some users feel the overall cost is higher than competitors, though they typically acknowledge the quality of materials and fit as justifying it. A few reviews mention that the blued finish requires more attention in wet field conditions than a stainless option would.