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Nemo
The Nemo Arms Omen Mongoose 9mm with brace is a compact, lightweight pistol-caliber carbine built for shooters who want low-recoil performance in a short package. Whether you're running competition courses, setting up for home defense, or just putting rounds downrange at the range, the Mongoose delivers the handling and ergonomics of a rifle platform in a size that fits tight spaces and vehicles. At 3.6 pounds unloaded, it won't wear you out during extended shooting sessions, and the short-recoil operating system keeps muzzle impulse manageable even in confined spaces.
The Mongoose ships configured with an SB Tactical FS1913 brace and comes ready to suppress or run open—you get both a flat end cap for suppressed shooting and a compensator end cap for unsuppressed use. The 5.8-inch steel barrel is threaded 1/2x28 (QPQ nitrided for durability) and features a 1:10 twist. The receiver package combines a lightweight extruded aluminum upper with a billet lower, keeping weight down without sacrificing rigidity. An integral 10.25-inch top Picatinny rail gives you room for optics, and M-LOK slots at 3, 6, and 9 o'clock let you run lights, lasers, or grip solutions exactly where you need them.
Ergonomics are where the Mongoose shines for serious use. You get an ambidextrous safety selector, ambi bolt catch and release with last-round bolt-hold-open, ambi magazine release, and a non-reciprocating charging handle that works either side. The ALG ACT trigger breaks cleanly, and the MAGPUL MOE SL grip fits naturally in most hands. A 35-round MAGPUL PMAG (EV9) comes loaded in the box, plus a rear picatinny rail on the back plate for sling mounts and accessories. Field stripping is AR-familiar—two pin takedown, easy lever access to the bolt and barrel—so if you know the platform, you'll be comfortable here. The package includes a soft range bag and owners manual with product registration.
One note: the Mongoose is chambered for standard 9mm Luger (9×19mm) only; do not use +P+ ammunition. If you're running a suppressor, stick to units with a booster no longer than 5 inches and under 8.5 ounces.
| Caliber | 9mm Luger (9×19mm) |
| Barrel Length | 5.8 inches |
| Overall Length | 13.67 inches (stock closed); 23.38 inches (with extended brace) |
| Weight | 3.6 lb (firearm only); 4.26 lb (with brace) |
| Action | Short-recoil operating system |
| Upper Receiver | Extruded aluminum with integral 10.25" top Picatinny rail |
| Lower Receiver | Billet aluminum |
| Barrel | NEMO 5.8" steel, 1:10 twist, threaded 1/2×28, QPQ nitrided |
| Muzzle | Flat end cap (suppressed) and compensator end cap (unsuppressed) included |
| Handguard | Integral design with 10.25" top rail and M-LOK at 3, 6, 9 o'clock |
| Charging Handle | Non-reciprocating forward, ambidextrous |
| Trigger | ALG ACT |
| Safety | Ambidextrous selector |
| Bolt Catch | Ambidextrous with last-round bolt-hold-open |
| Magazine Release | Ambidextrous |
| Grip | MAGPUL MOE SL |
| Brace | SB Tactical FS1913 |
| Included Magazine | MAGPUL 35-round PMAG 35 EV9 |
| Recoil System | Bolt-captured spring, guide rod, secondary buffer spring/plunger |
| Ammunition | 9mm Luger only; do not use +P+ loads |
| Suppressor Compatibility | Recommended: booster ≤5", ≤8.5 oz (check suppressor specs) |
| Warranty | Limited lifetime warranty |
The Mongoose is chambered for standard 9mm Luger (9×19mm) ammunition. Do not use +P+ loads in this firearm. Stick to factory standard 9mm for safe and reliable operation.
The barrel is threaded 1/2×28. Nemo recommends suppressors with a booster no longer than 5 inches and weighing no more than 8.5 ounces. Always verify your suppressor specs against these limits before mounting.
The Mongoose ships with the SB Tactical FS1913 brace installed, a 35-round MAGPUL PMAG 35 EV9, two muzzle end caps (flat for suppressed use, compensator for open), a custom NEMO soft range bag, an owners manual, and product registration information.
Yes. The Mongoose uses an AR-style two-pin takedown and includes an easy lever to field-strip the bolt and barrel. If you're familiar with AR platforms, you'll find this straightforward.
The integral top Picatinny rail is 10.25 inches long, giving you plenty of real estate for optics. M-LOK slots at 3, 6, and 9 o'clock allow mounting of lights, lasers, or grips as needed.
Nemo
The Nemo Arms Omen Mongoose 9mm with brace is a compact, lightweight pistol-caliber carbine built for shooters who want low-recoil performance in a short package. Whether you're running competition courses, setting up for home defense, or just putting rounds downrange at the range, the Mongoose delivers the handling and ergonomics of a rifle platform in a size that fits tight spaces and vehicles. At 3.6 pounds unloaded, it won't wear you out during extended shooting sessions, and the short-recoil operating system keeps muzzle impulse manageable even in confined spaces.
The Mongoose ships configured with an SB Tactical FS1913 brace and comes ready to suppress or run open—you get both a flat end cap for suppressed shooting and a compensator end cap for unsuppressed use. The 5.8-inch steel barrel is threaded 1/2x28 (QPQ nitrided for durability) and features a 1:10 twist. The receiver package combines a lightweight extruded aluminum upper with a billet lower, keeping weight down without sacrificing rigidity. An integral 10.25-inch top Picatinny rail gives you room for optics, and M-LOK slots at 3, 6, and 9 o'clock let you run lights, lasers, or grip solutions exactly where you need them.
Ergonomics are where the Mongoose shines for serious use. You get an ambidextrous safety selector, ambi bolt catch and release with last-round bolt-hold-open, ambi magazine release, and a non-reciprocating charging handle that works either side. The ALG ACT trigger breaks cleanly, and the MAGPUL MOE SL grip fits naturally in most hands. A 35-round MAGPUL PMAG (EV9) comes loaded in the box, plus a rear picatinny rail on the back plate for sling mounts and accessories. Field stripping is AR-familiar—two pin takedown, easy lever access to the bolt and barrel—so if you know the platform, you'll be comfortable here. The package includes a soft range bag and owners manual with product registration.
One note: the Mongoose is chambered for standard 9mm Luger (9×19mm) only; do not use +P+ ammunition. If you're running a suppressor, stick to units with a booster no longer than 5 inches and under 8.5 ounces.
| Caliber | 9mm Luger (9×19mm) |
| Barrel Length | 5.8 inches |
| Overall Length | 13.67 inches (stock closed); 23.38 inches (with extended brace) |
| Weight | 3.6 lb (firearm only); 4.26 lb (with brace) |
| Action | Short-recoil operating system |
| Upper Receiver | Extruded aluminum with integral 10.25" top Picatinny rail |
| Lower Receiver | Billet aluminum |
| Barrel | NEMO 5.8" steel, 1:10 twist, threaded 1/2×28, QPQ nitrided |
| Muzzle | Flat end cap (suppressed) and compensator end cap (unsuppressed) included |
| Handguard | Integral design with 10.25" top rail and M-LOK at 3, 6, 9 o'clock |
| Charging Handle | Non-reciprocating forward, ambidextrous |
| Trigger | ALG ACT |
| Safety | Ambidextrous selector |
| Bolt Catch | Ambidextrous with last-round bolt-hold-open |
| Magazine Release | Ambidextrous |
| Grip | MAGPUL MOE SL |
| Brace | SB Tactical FS1913 |
| Included Magazine | MAGPUL 35-round PMAG 35 EV9 |
| Recoil System | Bolt-captured spring, guide rod, secondary buffer spring/plunger |
| Ammunition | 9mm Luger only; do not use +P+ loads |
| Suppressor Compatibility | Recommended: booster ≤5", ≤8.5 oz (check suppressor specs) |
| Warranty | Limited lifetime warranty |
The Mongoose is chambered for standard 9mm Luger (9×19mm) ammunition. Do not use +P+ loads in this firearm. Stick to factory standard 9mm for safe and reliable operation.
The barrel is threaded 1/2×28. Nemo recommends suppressors with a booster no longer than 5 inches and weighing no more than 8.5 ounces. Always verify your suppressor specs against these limits before mounting.
The Mongoose ships with the SB Tactical FS1913 brace installed, a 35-round MAGPUL PMAG 35 EV9, two muzzle end caps (flat for suppressed use, compensator for open), a custom NEMO soft range bag, an owners manual, and product registration information.
Yes. The Mongoose uses an AR-style two-pin takedown and includes an easy lever to field-strip the bolt and barrel. If you're familiar with AR platforms, you'll find this straightforward.
The integral top Picatinny rail is 10.25 inches long, giving you plenty of real estate for optics. M-LOK slots at 3, 6, and 9 o'clock allow mounting of lights, lasers, or grips as needed.
