The GrovTec Hammer Extension (GrovTec part no. GTHM308) bolts onto the hammer spur of the Marlin 36 (built 1936-1947) and Marlin 336 (built 1948-1956), giving you more surface area to engage the hammer cleanly with a gloved or cold thumb. GrovTec builds this extension from black steel to match the lever gun’s factory hardware. It’s especially useful once a scope is mounted low over the receiver, where the factory hammer spur can be hard to reach with the optic in the way. This is a straightforward, direct-fit upgrade for anyone running an older Marlin lever rifle in the field or at the range.

Key Specifications

• Fits the Marlin 36, produced from 1936 to 1947.
• Also fits the Marlin 336, produced from 1948 to 1956.
• Built from black steel to match factory lever-gun hardware.
• Adds hammer surface area, making it easier to thumb-cock with a scope mounted low.
• Functions as a hammer extension, not a full replacement hammer, clipping onto the factory spur.
• Ships at a light 0.055 lb, adding almost nothing to your order.
• CNC-machined for a precise, drop-in fit against the factory hammer spur.
• Cut with an aggressive knurled texture for a slip-resistant grip in gloved or cold hands.

Frequently Asked Questions

What rifles does this hammer extension fit? The Marlin 36 (1936-1947) and Marlin 336 (1948-1956), specifically.

Why add a hammer extension? It gives you more surface area to reach and cock the hammer, which matters most once a low-mounted scope partially covers the factory spur.

Buy the GrovTec Hammer Extension for Marlin 36 and Marlin 336

A vintage Marlin lever gun deserves to stay easy to run in the field, and this hammer extension is a cheap, direct-fit way to keep the hammer accessible once glass is mounted. Order it from our Lubbock, Texas gun shop and it ships fast to your door, along with more gun accessories and parts.