Shop › GROVTEC MARLIN LVR ACTION HAMMER EXT GROVTEC MARLIN LVR ACTION HAMMER EXT $12.78 GrovTec Hammer Extension, Fits All Marlin Lever Actions Made in 1983 & Later GTHM74 Quantity: Add To Cart Added! GrovTec Hammer Extension, Fits All Marlin Lever Actions Made in 1983 & Later GTHM74