GrovTec Hammer Extension Marlin Lever Actions 1957-1982 GTHM70

GrovTec Marlin Lever Action Hammer Extension 1957–1982 – GTHM70

The GrovTec GTHM70 is a drop-in hammer extension purpose-built for Marlin lever action rifles manufactured between 1957 and 1982. Designed for hunters and shooters who want faster, more positive hammer manipulation — especially with gloves on or in cold-weather conditions — this extension gives you a larger, more accessible hammer spur without any permanent modification to your firearm. A straightforward upgrade for anyone running a classic mid-century Marlin in the field or at the range.

Fits hammer opening dimensions of 0.320" × 0.094". Minor fitting may be required as hammer tolerances can vary between individual firearms.

• Fits Marlin lever action rifles manufactured 1957–1982
• Hammer opening: 0.320" × 0.094"
• Improves hammer access — ideal for gloved or cold-weather use
• No permanent modification required
• Note: Minor fitting may be required — lightly file the opening if needed for a secure fit. Liquid bluing can be used to re-coat bare metal after fitting
• Not recommended for use on hammers or models not listed above