OM 50 Nemesis
Advanced Military Systems Design (AMSD) · Sniper Rifle · In Production · 2003
Also known as: SAN 511, Nemesis .50
Overview
The OM 50 Nemesis is a Swiss bolt-action anti-materiel rifle chambered in .50 BMG, designed by AMSD (Advanced Military Systems Design). The concept was devised in 2001 by retired US Marine Corps officer James Owens and Swiss engineer Chris Movigliatti, with the first production batch delivered in 2003. All OM 50 Nemesis rifles are built around the same aviation-grade aluminum alloy receiver and steel bolt group with a manually operated rotary bolt. The bolt heads lock directly into the barrel extension with three radial lugs, relieving the receiver from most stress and providing constant headspace. The rifle's most distinctive feature is its modular barrel system, offering barrel lengths from 381mm (15 inches) for short-range urban work to 900mm (35.5 inches) for long-range precision shooting. The folding stock allows overall length to be reduced significantly for transport. Reported accuracy is 0.5 MOA at 300 meters and sub-1 MOA at 1,000 meters.
Specifications
| Weight (empty) | 11400 g (402.1 oz) |
| Overall Length | 1350 mm (53.15") |
| Folded Length | 1050 mm (41.34") |
| Barrel Length | 700 mm (27.56") |
| Action Type | Bolt Action |
| Firing Mechanism | Striker Fired |
| Trigger Type | Single Stage |
| Magazine Capacity | 5 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 928 m/s (3045 fps) |
| Muzzle Energy | 18050 J (13313 ft·lbf) |
| Effective Range | 1500 m (1640 yd) |
| Maximum Range | 3000 m (3281 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 381 mm (15.00") |
| Frame Material | Aluminum Alloy |
| Barrel Material | Steel |
| Stock Material | Polymer Adjustable |
| Finish | Matte Black |
Calibers
- .50 BMG · primary · 12.7x99mm NATO — also known as 12.7x99mm, .50 Browning Machine Gun, 12.7x99mm NATO
Features
- Firing modes: Manual
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety
- Features: Modular Barrel System, Folding Stock, Muzzle Brake, Bipod, Picatinny Rail, Quick Change Barrel, Suppressor Ready
Variants
- SAN 511 — Licensed Production
- OM 50 Nemesis Mk II — Magazine Fed
- OM 50 Nemesis Mk III — Improved
- OM 50 Nemesis Mk 4 — Current Production
- OM 50 Nemesis Mk 5 — Heavy Barrel
Production
Production years: 2003-present
Produced by AMSD in Switzerland and under license by Swiss Arms as SAN 511. Exact production numbers not publicly disclosed.
Origin
Country of origin: Switzerland
Designer: James Owens, Chris Movigliatti
Notes
Swiss Arms (formerly SIG) later acquired licensing rights to manufacture and further develop the Nemesis, producing it as the SAN 511 in two versions: the 511-1 and the heavier, more durable 511-2. Both versions are offered with five different barrel lengths. The OM 50 Nemesis was one of the first .50 BMG rifles to offer a truly modular barrel system with barrels that can be changed by the operator in the field without tools, while maintaining sub-MOA accuracy.
Background
The OM 50 Nemesis was born from an unusual transatlantic collaboration between a retired US Marine officer and a Swiss engineer. Its modular barrel system allows operators to configure the rifle from a compact 15-inch barreled urban tool to a full-length 35.5-inch precision platform in minutes, making it one of the most versatile .50 BMG rifles ever produced.