NEMO Mongoose 9mm 5.8″ Threaded Pistol w/ Brace 35rd

Description

The NEMO Mongoose 9mm 5.8″ Threaded Pistol w/ Brace 35rd is a compact, lightweight pistol-caliber carbine built for ranch work, home defense, and steel plate matches. It ships with an SB Tactical FS1913 brace, a MAGPUL MOE SL grip, and a 35-round PMAG, all ready to run out of the box.

Manufacturer	NEMO Arms
Model	OMEN Mongoose
Material	7075-T6 aluminum upper and lower receiver, steel barrel
Compatibility	9mm Glock-style magazines (MAGPUL PMAG 35 EV9 included)
Finish	Type III hard coat anodized black
Weight	5.2 lbs (with brace and empty magazine, per manufacturer specs)
Condition	New

Key Features

• Short-recoil operating system – Why it matters: Reduces felt recoil and keeps the muzzle flat for fast follow-up shots, exactly what you need when clearing a coyote from the barn or running a stage at a match.
• 5.8″ threaded barrel (1/2×28) – Why it matters: Lets you mount a suppressor, compensator, or flash hider without buying a new barrel. The short length keeps the gun maneuverable in tight spaces.
• Integral M-LOK handguard – Why it matters: Attach a light, laser, or foregrip directly to the handguard without extra rails. No wobble, no extra weight.
• SB Tactical FS1913 brace – Why it matters: Gives you a stable shooting platform without the NFA paperwork. Adjustable for length of pull, folds flat for storage in a truck bag or safe.
• MAGPUL MOE SL grip and 35-round PMAG – Why it matters: Ergonomic grip reduces hand fatigue during long range sessions. The PMAG is drop-resistant and feeds reliably—no jams when you need it most.

Who It’s For

This pistol is built for the rancher who needs a truck gun that can handle varmints, the competition shooter who wants a flat-shooting 9mm, and the homeowner who wants a compact defense tool that works with a suppressor. If you spend more time on the range or in the field than reading spec sheets, this gun speaks your language.

Pros & Cons

• Pro: Short-recoil system makes it softer shooting than blowback 9mm pistols.
• Pro: Threaded barrel is suppressor-ready without adapter rings.
• Pro: Lightweight at 5.2 lbs—easy to carry all day.
• Con: The FS1913 brace is polymer and can flex under heavy use. If you plan to use it as a primary shooting platform, consider upgrading to a metal brace or a stock after Form 1.

Comparison

Feature	NEMO Mongoose 9mm	Zev Technologies OZ9C	Agency Arms AOS G19
Barrel length	5.8″ threaded	4.5″ threaded	4.0″ threaded
Operating system	Short-recoil	Striker-fired (blowback)	Striker-fired (blowback)
Brace included	SB Tactical FS1913	None (pistol only)	None (pistol only)
Magazine capacity	35 rounds (PMAG)	18 rounds (OEM)	15 rounds (OEM)
Weight	5.2 lbs	1.8 lbs (pistol only)	1.6 lbs (pistol only)
Price	$2,541.55	$1,899.00	$1,699.00

The Mongoose is heavier and more expensive than a standard pistol, but it includes a brace, longer barrel, and higher capacity out of the box. If you want a complete package without buying extra parts, the Mongoose wins. The Zev and Agency are better for concealed carry or if you already own a brace.

FAQ

What is the thread pitch on the barrel?

1/2×28, the standard for 9mm suppressors and compensators.

Will this work with my Glock 19 magazines?

It ships with a MAGPUL PMAG 35 EV9, which fits Glock 19/17 frames. OEM Glock 19 magazines will also work, but the PMAG is recommended for best reliability.

Can I install a stock instead of the brace?

Yes, but you must file a Form 1 with the ATF first to register it as a Short-Barreled Rifle (SBR). The brace is intended for pistol configuration.

Is the handguard removable?

Yes, the integral handguard is attached via a barrel nut and can be replaced with aftermarket M-LOK handguards. Per NEMO Arms, the handguard is designed for easy disassembly.

Does it come with a case?

No, the firearm ships in a cardboard box. We recommend a soft case or hard case for transport.

✔ Nationwide delivery (all 50 states) – ✔ Ships 1-2 business days – ✔ 30-day returns – ✔ Secure checkout

AR Pistols | 9mm Pistols | NEMO Arms

Last updated: April 2026