Originally known as the Improved Henry due to its patented loading gate on the side of the frame, designed by Nelson King, Winchester's plant superintendent, and the addition of a wood forearm, the 1866 model was known as the Yellow Boy by the Native Americans, because of its brass frame.
- Brass Receiver
- Octagon Barrel
- Adjustable Rear Sight
- Side Loading Gate
Cimarron 1866, Yellowboy Sporting, Lever Action Rifle, 45 Long Colt, 24" Octagon Barrel, Brass Receiver, Blued Barrel, Walnut Stock, 10 Rounds CA229
Specifications
| Model | 1866 |
| Caliber | 45 Long Colt |
| Brand | Cimarron |
| Color | Blue |
| Manufacturer Part # | CA229 |
| Subcategory | Hunting Rifles |
| Sights | Adjustable Rear Sight |
| Action | Lever |
| Capacity | 10 Rounds |
| Type of Barrel | Octagon |
| Stock | Wood |
| Finish | Blued |
| Barrel Length | 24" |