| Remington Model 51 | |
|---|---|
 The Remington 51, left side | |
| Type | Semi-automatic pistol |
| Place of origin | United States |
| Production history | |
| Designer | John Pedersen |
| Designed | 1917 |
| Manufacturer | Remington Arms Company |
| Produced | 1918–1926 |
| No. built | Approx. 65,000 |
| Variants | Remington 53 |
| Specifications | |
| Mass | 21 oz (600 g) |
| Length | 6+5⁄8 in (168 mm) |
| Barrel length | 3+1⁄4 in (83 mm) |
| Width | 0.9 in (22.9 mm) |
| Cartridge | .32 ACP .380 ACP |
| Action | Hesitation locked |
| Feed system | 8-round (.32 ACP) or 7-round (.380 ACP) detachable single-stack box magazine |
| Sights | Post and rear notch |
The Remington Model 51 is a small pocket pistol designed by John Pedersen and manufactured by Remington Arms in the early 20th century for the American civilian market. Remington manufactured approximately 65,000 Model 51 pistols in .32 ACP and .380 ACP calibers from 1918 to 1926, though small numbers were assembled into the mid-1930s.