7,65 mm Bergmann M/20
Mp18
6,5 mm Infantry Rifle M/96, Swedish Mauser
6,5 mm machinegun M/14 Schwarzlose
Mauser M/94-14 carbine
Light machine gun Kg m/1921
Kg m/40 automatic rifle
7,62 mm and 7,70 mm Vickers Machineguns
7,92 mm Maxim MG-08
7,62 mm Maxim M/09-21:
7,62 ItKk/31 VKT
7,62 ItKk/31-40 VKT
8,00 ItKk/36
machinegun L-33
7,62 mm and 7,71mm light machineguns M/Lewis
6,55 mm Rifle M/02 Japanese
7,62 mm Rifle M/1895 Winchester
10,67 mm Infantry Rifle M/1870 Berdan (Berdan II) This one is russian but due to its age I highly doubt it was used by soviets.
7,35 mm Rifle M/38
6,55 mm Infantry Rifle and Carbine M/05 Japanese
6,55 mm Infantry Rifle and Carbine M/97 Japanese
7,65 mm Pistol M/23 and 9 mm Pistol M/08 Parabellum
9 mm Pistol L-35 "Lahti
7,63 mm and 9 mm M/96 Mauser “Ukko-Mauser”
7,65 mm Pistol M/19 “Spanish”
7,65 mm Pistols M/1910 FN and M/1910-22 FN ( Continuation war )
9 mm Pistols M/03 FN and M/07 Husqvarna
9 mm Pistol M/35 FN “GP”
7,65 mm Pistols M/15 and M/19 Beretta ( continuation war )
9 mm Pistol M/34
7,65 mm Pistol M/35 Beretta ( continuation war )
9 mm Pistol M/23 CZ (vz.24) ( continuation war )
9 mm Pistol M/39 ( continuation war )
7.65 mm M/1914 Mauser ( found in inventory usage unknown )
7.65 mm M/SAUER modell 14 ( same as above )
7.65 mm Browning M/1900 ( same as above )
7.65 mm Bayard (M/1908)
7.65 mm M/Dreyse (M/1907)
7.65 mm M/Walther 4
7.65 mm M/Beholla
11,5 mm Colt (M1911)
And ofc, theres even more variety if we extend the campaign to continuation war and include some intresting imported guns and prototypes.
Such as
7,65 mm and 9 mm M/Neuhausen MKMS:
9 mm MP 28-II not exactly something new but used during continuation war.
9 mm MP-38 and MP-40 same as above.
7,62 mm general purpose machinegun L-41 “Sampo”
7,92 mm light machinegun FN D:
8 mm light machinegun M/15 Chauchat:
7,5 mm light machinegun M/24-29 Chatellerault
some prototypes
9 mm submachine gun M/42 Suomi
Prototype L-36
Aimo Lahti’s L-39 prototype
Carl Pelo and his automatic rifle prototype
Submachine guns of Carl Pelo
Heavy submachinegun AL-43 prototype this one would be intresting as it uses various intermediate cartridges such as 9x35
7,62 mm light machinegun L-34 “Sampo”
7.62 mm general purpose machinegun MG 42
Il also throw TaPaKo rifle here even theres very little information about it. Build by sako anyway and only 1 made.
so its not like there aint options to fill it.