Lyman Great Plains Rifle .50 Cal Percussion Muzzleloader, Kit-Built, 32-inch Heavy Octagon Barrel, Double-Set Triggers
This Lyman Great Plains Rifle is a .50 caliber percussion muzzleloader assembled from a factory kit and built in Italy by Investarm S.p.A. It features a 32-inch heavy octagonal barrel, double-set adjustable triggers, and a right-hand sidelock. The barrel is browned, the lock is case-colored, and the gun carries Italian proof/date-code markings along with clear Lyman barrel stamps.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Fouling: Mild Fouling - Light buildup of fouling or dirt.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: The wood furniture is in excellent condition. There is rust present throughout the metal surfaces. The bore shows mild fouling inside the barrel. A careful cleaning and light restoration should address these issues.
What’s Included
- Cleaning rod with brass tip
- Wood ramrod with brass tip (installed)
Built from a Lyman Great Plains Rifle percussion kit, this example retains the classic single-shot, muzzleloading sidelock configuration with a snail breech and nipple. The right-hand lock and robust heavy-profile barrel underscore its traditional plains-rifle layout. Barrel markings include "LYMAN – MIDDLETOWN, CT USA" and "GREAT PLAINS RIFLE .50."
The barrel is a 32-inch heavy octagon, marked "MADE IN ITALY – BLACK POWDER ONLY," and proofed with Italian stamps. The metal presents a browned barrel finish paired with a case-colored lock/receiver, providing a period-correct appearance.
Handling features include double-set, adjustable triggers; a hardwood half-stock secured by two wedge keys; and steel furniture comprising the buttplate, wedge escutcheons, and thimbles. Length of pull measures 14.0 inches. Sights are open iron, with a dovetailed front blade and an elevator-adjustable rear.
Manufactured by Investarm S.p.A. in Italy for Lyman, this is a modern reproduction built from a factory kit. Because it was kit-assembled, we recommend taking it to a professional gunsmith before operating.