| O. D. I., Inc. |
US |
Middlepark, NJ |
| O. F. Mossberg & Sons |
US |
|
| O. H. Iris (Orbea Hermanos) |
SP |
Model of Orbea |
| O. H. Oscillante |
SP |
Mfd. by Eulugio Arrostegui |
| O. V. (Ojanguren & Vidosa) |
SP |
|
| O. W. A. |
AU |
|
| Oak Leaf |
US |
Various mfrs. |
| Obregon |
SP |
|
| O'Brien Rifle Co. |
US |
|
| Oddity Arms Co. |
US |
Mfr. of knife pistols |
| Officer's ACP |
US |
|
| Officer's Model |
US |
|
| Oicet |
SP |
Mfd. by Antonio Errasti |
| Ojanguren & Vidosa (O. V.) |
SP |
|
| Okzet |
GE |
Mfd. by August Menz |
| Old Reliable |
US |
Marking on Sharps-Borchardt |
| Old-Colony |
US |
rifles Brand name of Crescent |
| Olin-Kodensha Co. |
JA |
|
| Olin-Mathieson Corp. |
US |
Mfd. by Winchester |
| Olympia Pistole |
SZ/GE |
|
| Olympian |
BG |
Mfd. by Fabrique Nationale |
| Olympic |
US |
Brand of various mfrs. |
| Olympic (pistols) |
US |
Model of High Standard |
| Olympic (rifles) |
GE |
Model of Voere |
| Olympic (rifles) |
GE |
Model of Walther |
| OM |
SP |
Brand of Ojanguren y Marcaide |
| Omar |
IT |
Shotgun; old trade name of Masieri which is
now Armi Atis |
| Omega (handguns) |
US |
|
| OMC Back Up |
US |
Importer of handguns from Spain, Italy, and
Germany |
| Omega (rifles) |
US |
Model of Firearms |
| Omega Defensive Inds. |
US |
|
| Onandia |
SP |
|
| Onena |
SP |
Development Co. Brand of Star |
| Opotschno |
- |
Not a brand; city in Czechoslovakia |
| Orava |
FD |
Mfd. by Valmet |
| Orbea/Orbea Brothers/Orbea Hermanos |
SP |
|
| Ordinanza |
IT |
|
| Ordnance Design Co. |
US |
|
| Ordnance Mfg. Co. (OMC) |
US |
|
| Ordnance Technology |
US |
Stetson, ME |
| Ordonnance |
BG |
|
| Oregon Arms, Ltd. |
US |
Prospect, OR |
| Ormachea, Fernando |
SP |
|
| Ortgies |
GE |
Pistols mfd. by Deutsche Werke and various
other mfrs. |
| Oscilante-Azul |
SP |
|
| Oscillante, B. H. |
SP |
Mfd. by Beistegui Hermanos |
| Oscillante, O. H. |
SP |
Mfd. by Eulogio Arrostegui |
| Osgood Gun Works |
US |
|
| Osprey |
US |
|
| Osteneichisha |
GE |
|
| Oterr-Sterr |
- |
|
| Otis A. Smith |
US |
|
| Overland |
BZ |
Model of Amadeo Rossi & Co. |
| Oviedo |
SP |
Government arsenal |
| Owen |
AS |
Submachine guns |
| Oxford Arms Co. |
US |
Mfd. by Crescent |
| Oyez |
BG |
|
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- Edoardo Mori 
