These are some different weapons on display at the Military Museum in Belgrade, Serbia. Unfortunately I did not go; pictures and commentary in italics are borrowed. By the way, pictures are not allowed in the museum. . .
1st: I need to clean this up: it is a handmade wooden insert, to make a stock, in a wire-stock Sten, Partisan. It's interesting about Ex-Yugo and Serbian Mountain, and Montenegrin guns; even if the gun originally doesn't lend itself to decoration, we'll find a way. Also in the Beograd War Museum is an MP38 with the plastic/Bakelite furniture replaced with hand-carved wood, so expertly done I had to take a better look at it to believe it.
2nd: . . . these specimens are two different [Chauchats] up in the 'WWII' section, not in the 'WWI' section; they have different magazine wells riveted on; they are both different. The mag wells look either bronze or brass, and use magazines that are not, NOT, MG13." The plaque behind it reads: "Chauchat Light machine gun belonging to the security of the Supreme Headquarters of the People's Liberation Movement of Serbia, 1941. This would mean the Partisans used it.
3rd: Also: regarding the 'Polish' Chauchat: a significant proportion of 'Nazi' troops in the Balkans were various ethnicities from modern-thought Poland, Belorussia, Ukraine, etc. So Polish Chauchats showing up in the Balkans after 1941 isn't too nutty; it doesn't mean they were sold to Jugoslavia, it just means they got found there, later. You wouldn't believe the homemade stuff floating around in the mountains. Think it can't be made to work? You have clearly never been to the Balkans. Where concern for your personal safety is for sissies.
According to Honor Bound: The Chauchat Machine Rifle pg 174: "Orders in the French archives also document that at least 1,400 CSRGs were shipped to the Serbian Army, through the port of Salonica, From December, 1916 to April, 1917. We have no information on the use of the CSRG by the Serbian Army, other that some of these guns found their way into the hands of Yugoslav Partisans during WWII.
Although there is also some documentation to the effect that the Serbs used CSRGs in 7.92x57mm Mauser calibre, the single specimen of the CSRG displayed in the Serbian Army Museum, at the Citadel, in Belgrade, is in 8mm Lebel."
The Chauchat looks like the Polish "RKM wz15/27" model, with the later conversion to 8mm Mauser.
4th: A French Darne Model 1922 machine gun, a lesser known design of which some were exported to Serbia. It was designed in WWI but not produced until after. The aircraft version was more popular. Next to this are a Yugo M1924 Mauser, and Gasser "Montenegrin" style revolver.
5th: A number of weapons. Bottom is an Italian Breda M1930 light machine gun; next up is a Czech-made German PzB M.SS.41 or PzB-41(t) anti-tank rifle; next up is a Madsen light machine gun. Behind these are an Italian Beretta M1938 submachine gun; next up is a German Steyr-Solothurn MP34 submachine gun; next up is a German MP40 submachine gun. Left to right on the back wall are a German Mauser G33/40 rifle; next right is a post-WWI model Italian Carcano; next right is a Steyr M95 carbine; next right is an Italian Carcano rifle.
6th: Large WWI-era flash suppressor on a St. Etienne heavy machine gun.
7th: German Mauser full-auto C96 pistol.
1st: I need to clean this up: it is a handmade wooden insert, to make a stock, in a wire-stock Sten, Partisan. It's interesting about Ex-Yugo and Serbian Mountain, and Montenegrin guns; even if the gun originally doesn't lend itself to decoration, we'll find a way. Also in the Beograd War Museum is an MP38 with the plastic/Bakelite furniture replaced with hand-carved wood, so expertly done I had to take a better look at it to believe it.
2nd: . . . these specimens are two different [Chauchats] up in the 'WWII' section, not in the 'WWI' section; they have different magazine wells riveted on; they are both different. The mag wells look either bronze or brass, and use magazines that are not, NOT, MG13." The plaque behind it reads: "Chauchat Light machine gun belonging to the security of the Supreme Headquarters of the People's Liberation Movement of Serbia, 1941. This would mean the Partisans used it.
3rd: Also: regarding the 'Polish' Chauchat: a significant proportion of 'Nazi' troops in the Balkans were various ethnicities from modern-thought Poland, Belorussia, Ukraine, etc. So Polish Chauchats showing up in the Balkans after 1941 isn't too nutty; it doesn't mean they were sold to Jugoslavia, it just means they got found there, later. You wouldn't believe the homemade stuff floating around in the mountains. Think it can't be made to work? You have clearly never been to the Balkans. Where concern for your personal safety is for sissies.
According to Honor Bound: The Chauchat Machine Rifle pg 174: "Orders in the French archives also document that at least 1,400 CSRGs were shipped to the Serbian Army, through the port of Salonica, From December, 1916 to April, 1917. We have no information on the use of the CSRG by the Serbian Army, other that some of these guns found their way into the hands of Yugoslav Partisans during WWII.
Although there is also some documentation to the effect that the Serbs used CSRGs in 7.92x57mm Mauser calibre, the single specimen of the CSRG displayed in the Serbian Army Museum, at the Citadel, in Belgrade, is in 8mm Lebel."
The Chauchat looks like the Polish "RKM wz15/27" model, with the later conversion to 8mm Mauser.
4th: A French Darne Model 1922 machine gun, a lesser known design of which some were exported to Serbia. It was designed in WWI but not produced until after. The aircraft version was more popular. Next to this are a Yugo M1924 Mauser, and Gasser "Montenegrin" style revolver.
5th: A number of weapons. Bottom is an Italian Breda M1930 light machine gun; next up is a Czech-made German PzB M.SS.41 or PzB-41(t) anti-tank rifle; next up is a Madsen light machine gun. Behind these are an Italian Beretta M1938 submachine gun; next up is a German Steyr-Solothurn MP34 submachine gun; next up is a German MP40 submachine gun. Left to right on the back wall are a German Mauser G33/40 rifle; next right is a post-WWI model Italian Carcano; next right is a Steyr M95 carbine; next right is an Italian Carcano rifle.
6th: Large WWI-era flash suppressor on a St. Etienne heavy machine gun.
7th: German Mauser full-auto C96 pistol.