page_title: M1895 Colt–Browning machine gun
section_title: Marlin Rockwell M1917/M1918 versions
hierarchical_section_title: M1895 Colt–Browning machine gun / Use / World War I / Marlin Rockwell M1917/M1918 versions
caption_attribution_description: English: Batey ha-Osef Museum, Tel Aviv, Israel.
context_page_description: The Colt–Browning M1895, nicknamed "potato digger" because of its unusual operating mechanism, is an air-cooled, belt-fed, gas-operated machine gun that fires from a closed bolt with a cyclic rate of 450 rounds per minute. Based on a John Browning and Matthew S. Browning design dating to 1889, it was the first successful gas-operated machine gun to enter service.
context_section_description: After Marlin started making the Colt 1914s, it developed an improved version of the M1895. In 1917 this was adopted by the US Army as a training weapon and approximately 2,500 were purchased. Besides its designation of Colt–Browning M1895/14, it was also called the "Marlin Gun" and "Model 1917". The primary improvement was the use of a detachable barrel, a more generous side plate cut-out and a sliding door on the right side plate opening (also made larger) for easier access. Despite these improvements, the Marlin was limited to 500 rounds of continuous fire due to a tendency to overheat. The Navy also purchased a version of the Marlin gun with a gas piston in lieu of the lever mechanism, although very few if any guns saw service aboard ship.
  A second, much more radical version of the M1895 was introduced in 1917 for tank and aircraft use, later designated the Marlin M1917 and M1918, with a Swedish armaments designer named Carl Gustave Swebilius responsible for the improvements. Like the Navy Marlins, these variants used a linear gas piston in place of the 'potato digger' arm and bore little outward physical resemblance to the basic "digger" design. The new reciprocating piston was located parallel to the barrel and below it, allowing the gun to be mounted lower to the ground. Another improvement was the addition of a breech-to-muzzle aluminum heat sink, with lengthwise fins and covering some 270° of the gun barrel's outer circumference's upper areas, to dissipate heat. Most Marlin M1917 and M1918 guns saw use in aircraft as defensive armament—however, as they retained the original M1895 "potato digger" ordnance's closed bolt firing cycle, these Marlin guns, weighing only some 25 pounds (11.34 kg) apiece, versus the standard Vickers gun's 33 pound (15 kg) figure for aviation use, could readily be used for forward-firing offensive armament with fighter aircraft, when used with synchronization gear for safely firing forward through a spinning propeller - the non-synchronizable, open bolt-firing cycle Lewis gun was still slightly heavier than the Marlin, at about 28 pounds (12.7 kg). By the last months of World War I, almost 50% of the SPAD XIII fighter aircraft used by the United States Army Air Service in France had their Vickers guns replaced with Marlins. Had the war lasted into 1919 the Marlin would have been the primary U.S. tank and aircraft gun. The M1917/1918 also equipped Thomas Morse Scout aircraft used for advanced training at stateside bases.
  A number of Colt and Marlin-made machine guns was also provided to Italian forces during World War I to replace similar weapons lost in the retreat that followed the massive Austrian-German breakthrough at the Battle of Caporetto. Besides being chambered for the standard 6.5×52mm Mannlicher–Carcano Italian rifle cartridge, they were converted to liquid cooling with the installation of a narrow brass sleeve around the barrel; M1895/14 machine guns receiving this modification were designated "6.5/80" and employed by the Regia Marina (Royal Italian Navy) as a field weapon for Marine infantrymen defending the mouth of the Piave river. They also appeared on Navy vessels, with as many as four equipping each Italian MAS (torpedo boat), on "Class F" submarines and on some destroyers. The MAS used by Gabriele D'Annunzio in the famous Beffa di Buccari and displayed at his former residence (Vittoriale degli italiani) still mounts a Colt M1895.
  The Marlin gun saw postwar use on the machine gun version of US Army's M1917 Tank, an American version of the French Renault FT. However, the Marlin guns quickly disappeared from U.S. military service after the great success of the .30 Browning machine guns and variants subsequently adopted for air, ground, and shipboard use, with the debut of the M1919 Browning machine gun air-cooled ordnance.
caption: The Marlin M1917 used a different operating mechanism and bears only a passing resemblance to the M1895/14 it was based on.
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