>>64105523 (OP)
Swiss Vetterli 1871/1881
Gehwer 1888 commission rifle
French Gras 1874
Dutch Beaumont- Vitali 1871/88
Italalian Veteri Vitali 1871/87
French Lebel 1886
Martini Enfield
Martini Henry
Lee Metford
Mauser 1871/84
Egyptian Remmington Rolling block
Snider cavalry carbine
Snider 2 and 3 band rifles
French/Danish/Swedish Rolling Blocks
Winchester 1873 and 1886 lever actions
Austro Hungarian Wanzl rifle
US trapdoor springfield
Most of these had fuck huge bayonets as well
Pistols
Webley RIC Bulldog Revolver
1879 Reichsrevolver
Apache knuckleduster revolver
Swiss Revolver 1882
MAS 1873 revolver
Remington U.S. Army 1871 rolling block pistol
British Webley Mk I service revolver 1887
Colt peacemaker 1873
English or Belgian side by side external hammers cartridge shotgun
Semi obsolete but around
Rigby Match Target rifle
Percussion side by side 44 pocket pistol
Percussion side by side shotguns
Belgian pin fire cartridge revolvers
Underlever pinfire shotguns
Colt pecussion arevolvers
Remmington percusison revolvers
Tranter and Adams revolvers
Pepperbox percussionn revolvers
single shot percussion pocket guns
I recommend that you look at the Adolf Frank Export Company (ALFA) 1911 Gun Catalog
https://archive.org/details/AlfaWaffenkatalog1911
which list most of a the military surplus models many predating 1890 and may also be a useful resource for other materials for your creation. Also check out the Call of Cthuhlu roleplaying game source books for more ideas (Investigator Weapons volume 3: Gaslight Era" from Sixtystone Press)
remember that people are not going to generally ahve access to what were state of the art newly issued military arms but gnerally older models and systems