GrovTec GTHM308 Hammer Extension Marlin 36/336 Black Steel

The GrovTec GTHM308 Hammer Extension transforms lever-action operation on vintage Marlin rifles, providing enhanced thumb contact and faster cycling. This precision-machined steel component addresses the narrow hammer spur found on classic Marlin 36 (1936-1947) and early Marlin 336 (1948-1956) models.

What Makes This Different

Unlike aftermarket hammer spurs that require permanent modification, this extension clamps securely over the existing hammer without drilling or machining. The extended profile increases surface area by 40% compared to factory configuration. Black oxide finish matches original Marlin components while providing corrosion resistance.

Key Features

• Direct-fit compatibility with Marlin 36 (1936-1947) and Marlin 336 (1948-1956) models
• 4140 steel construction with black oxide finish for durability
• Clamp-on design preserves original hammer integrity
• Extended thumb contact surface reduces cycling effort
• No gunsmithing or permanent modifications required
• Maintains factory hammer safety function
• Period-correct appearance for vintage rifles

Field performance shows measurable improvement in rapid-fire sequences and cold-weather operation when gloves reduce dexterity. The extended surface provides positive engagement during hunting scenarios where quick follow-up shots matter. Installation takes minutes with basic hand tools, making this upgrade accessible for any shooter.

Technical Specs

• Material: 4140 steel with black oxide finish
• Compatibility: Marlin 36 (1936-1947), Marlin 336 (1948-1956)
• Installation: Clamp-on design, no drilling required
• Weight: Approximately 0.5 oz
• Finish: Black oxide for corrosion resistance
• Country of Origin: United States

This hammer extension delivers practical improvement for collectors and hunters using vintage Marlin lever guns. The steel construction and precise fitment ensure reliable operation across thousands of cycles while maintaining the rifle's original character.