Description
French Chauchat Model 1915 CSRG Light Machine Gun
This Chauchat Model 1915 CSRG is an early demilled French light machine gun in 8mm Lebel, marked SIDARME with serial number 25871. It retains its folding bipod, semi-circular magazine, rear stock, vertical pistol grip, and original receiver markings. The gun shows the distinctive long tubular barrel jacket, open-sided magazine, and slim shoulder-stock profile associated with the French Mle 1915 automatic rifle.
Chauchat Model 1915 CSRG
The official French designation was Fusil Mitrailleur Modèle 1915 CSRG. The initials CSRG refer to Chauchat, Sutter, Ribeyrolles, and Gladiator, the principal names tied to the weapon’s design and production. French infantry used the gun as a portable automatic rifle during the First World War, and American Expeditionary Forces also used the 8mm Lebel version in 1917 and 1918.
This example carries the SIDARME marking rather than the better-known Gladiator marking. SIDARME, located at Saint-Chamond, became a later wartime producer of the CSRG. The visible markings include the star device, SIDARME, C.S.R.G. No. 25871, boxed SA inspection mark, and matching serial number 25871 on the rear barrel-jacket collar.
Construction / Configuration / Pattern
The Chauchat used a long-recoil operating system and a light, open-frame construction. The design aimed to give infantry squads a mobile automatic weapon that one gunner and an assistant could carry forward. It combined an in-line wooden buttstock, vertical pistol grip, detachable magazine, bipod, and selective-fire mechanism in a relatively light package for the period.
This gun retains the key visual features of the 8mm Lebel Mle 1915 pattern. The semi-circular magazine fits beneath the receiver and follows the rimmed 8mm Lebel cartridge curve. The folding bipod remains mounted near the front of the barrel assembly. The rear sight is present on the top of the receiver area. The wood buttstock and vertical pistol grip remain fitted and show the expected service profile.
The barrel jacket and receiver show an early demilitarization. The muzzle end cap is missing. The rear of the barrel-jacket collar shows the serial number 25871, and the front opening shows internal threads where the missing cap or muzzle assembly would have fitted. The gun still presents with the major external components that define the type.
Historical Context / Pattern Development
France adopted the Chauchat during the First World War because it needed a portable automatic weapon in large numbers. Heavy machine guns offered sustained fire, but they required more equipment and a larger crew. The Chauchat filled a different role. It gave infantry sections a light automatic arm that could move with assault troops across shell-torn ground.
The French placed the CSRG into regular infantry service in 1916. It became one of the most common automatic weapons of the war. Production reached roughly 262,000 guns by the end of 1918, including about 244,000 in 8mm Lebel. Gladiator produced most examples, while SIDARME joined production later and made 8mm Lebel guns only.
The gun’s reputation remains complicated. The Chauchat used forward-thinking ideas, including portability, a detachable magazine, pistol grip, in-line stock, and automatic fire from a shoulder-carried weapon. At the same time, wartime manufacturing shortcuts, exposed magazine openings, and trench conditions created well-known reliability problems. Mud and debris could enter the open-sided magazine, and the design suffered when poorly maintained or heavily fouled.
Even with those flaws, the Chauchat belongs to the early development of the modern squad automatic weapon. It tried to solve a real battlefield problem: how to place automatic fire in the hands of infantry moving forward without a heavy tripod. Later light machine guns and automatic rifles approached that problem with better engineering, but the CSRG remains an important First World War step in that progression.
The American Expeditionary Forces used many French 8mm Lebel Chauchats before the Browning Automatic Rifle became available in useful numbers. The later American .30-06 Model 1918 Chauchat performed poorly and gained much of the design’s worst reputation. The French 8mm Lebel model, while imperfect, saw far broader wartime service and remained the standard form of the type.
Condition
This is an early demilled display gun. The demil work appears properly executed and is visible in the receiver and barrel-jacket area. The gun remains in good overall condition for display.
The receiver markings remain visible and legible. The left side shows the SIDARME maker mark, star device, C.S.R.G. No. 25871, and boxed SA inspection mark. The rear barrel-jacket collar also shows 25871. The metal has a dark aged finish with scattered handling marks, light patina, and small areas of finish loss.
The bipod remains present and mounted. The magazine is present and shows age, patina, and service wear. The rear stock is in good condition, with handling marks, small dents, and surface wear but no major loss visible in the photographs. The vertical pistol grip also remains intact and shows similar age wear.
The muzzle end cap is missing. The front opening shows exposed internal threading and finish wear around the collar. The rear sight, stock hardware, sling loop, magazine, bipod, and main external assemblies remain present. Overall, the gun has a strong display profile and retains the principal features expected on a French Chauchat Mle 1915 CSRG.
