Shevchenko PSh-4
JO.LO.AR
Borschardt C-93
mannlicher 1894
Hamilton 1901
Grendel P-30
Pin fire revolver with cylinder going in different direction to get around colts patent?.
Bittner 1893, in 7.7mm Bittner caliber
The Apache
This is actually one of those Transformers that turns into a gun, like this Megatron one:
Got to be ugliest