The final and most refined Martini-Henry production variant, with improved lever geometry and action smoothness. Used in the Sudan campaigns and early India Frontier actions before the Lee-Metford replaced it. Many Mk IVs were converted to Martini-Enfield (using a Lee-Metford barrel) or Martini-Metford configuration for continued service. Type: Rifle Action: Falling Block Caliber: .577/450 Martini-Henry Capacity: 1 Year introduced: 1885, United Kingdom Weight: 144 oz Overall length: 49" Status: Discontinued Military use: Yes Intended use: military