Image unavailable
Sig Sauer M400-Forge Pistol 5.56 Nato 11.5" Barrel 30 Round
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$999.99
View on Fin Feather Fur Outfitters
You'll be taken to Fin Feather Fur Outfitters to complete your purchase.
Hunter's Outpost earns a commission from affiliate links at no extra cost to you.
SKU: PM400-556N-11B-FORGE-798681744107
Overview
Built for hunters and shooters who want a compact AR-pattern pistol with a duty-oriented setup, this model pairs an 11.5-inch cold hammer forged barrel with a carbine-length direct impingement system and semi-auto operation. It comes equipped with a ROMEO-MSR GEN II 2 MOA dot sight, a Magpul BSL pistol stabilizing brace, a TriggerTech 3.5-pound 2-stage flat blade trigger, and M-LOK plus full-length Picatinny rail space for accessories. The 5.56 NATO chambering and included 30-round polymer magazine make it suited to range use, training, or compact defensive applications where maneuverability matters. At 29.8 inches overall and 6.2 pounds, it offers a relatively compact footprint without adding unnecessary bulk.
Why Hunters Choose the Sig Sauer
Compact 11.5-inch
Barrel keeps the platform short
Cold Hammer
Forged steel barrel adds a
Carbine-length Gas
System supports smooth cycling in
Romeo-msr Gen
A 2 MOA dot
Triggertech 3.5-pound
Two-stage flat blade trigger is
Key Features
- Compact AR pistol platform chambered in 5.56 NATO.
- 11.5-inch cold hammer forged steel barrel with 1:7 twist rate.
- Carbine-length direct impingement operating system.
- ROMEO-MSR GEN II sight with 2 MOA dot included.
- Magpul BSL pistol stabilizing brace and reduced-angle grip.
- M-LOK forend with full-length Picatinny accessory rail.
- Includes one 30-round polymer magazine.
Best Used For
- Compact AR pistol setup for hunters needing a shorter firearm in tight blinds or vehicles.
- Users wanting a 5.56 NATO platform with included ROMEO-MSR GEN II red dot sight.
- Shooters who prefer a semi-auto pistol with M-LOK and full-length Picatinny accessory mounting.
- Hunters and outdoorsmen looking for a lightweight 6.2-pound firearm with a stabilizing brace.
- Those seeking a duty-style compact rifle alternative for range use and practical field carry.
Specifications
| Accessory Rail | M-LOK/Full-Length Picatinny |
|---|---|
| Action Type | Semi-Auto |
| Barrel Length | 11.5 in [292.1 mm] |
| Barrel Material | Cold Hammer Forged Steel |
| Caliber | 5.56 NATO |
| Collapsed Length | 27.8 in |
| Color | Black |
| Firearm Type | Pistol |
| Forend Type | M-LOK Black Anodized Alloy |
| Forward Assist | Yes |
| Grip Type | Reduced Angle |
| Magazine Type | AR-15 Mags |
| Mags Included | (1) 30rd Polymer Mag |
| Muzzle Device | A2 Birdcage Flash Hider |
| Operating System | Carbine Length Direct Impingement |
| Overall Length | 29.8 in [756.92 mm] |
| Receiver Finish | Black Anodized |
| Sights | ROMEO-MSR GEN II w/2 MOA DOT |
| Stock Type | Magpul BSL Pistol Stabilizing Brace |
| Trigger Type | TriggerTech 3.5-Pound 2-Stage Flat Blade |
| Twist Rate | 1:7 |
| Weight | 6.2 lb [2812.27 g] |
Pros
- Compact 11.5-inch barrel keeps the platform short and easy to handle.
- Cold hammer forged steel barrel adds a durable foundation.
- Carbine-length gas system supports smooth cycling in this setup.
- ROMEO-MSR GEN II sight is included with a 2 MOA dot.
- TriggerTech 3.5-pound two-stage flat blade trigger is specified.
- M-LOK and full-length Picatinny provide flexible accessory mounting options.
Considerations & Trade-offs
- The 11.5" barrel and compact pistol format favor maneuverability, but they also mean less overall length than a full-size rifle setup.
- It ships as a pistol with a stabilizing brace rather than a rifle stock, so it is configured differently than a standard carbine.
- The package includes one 30-round polymer magazine, so additional magazines may be needed for extended range or field use.
- The included ROMEO-MSR GEN II optic is part of the package, which adds value but also means the setup is already defined rather than fully bare.
Suggested Comparisons
- Compact AR pistol
- 5.56 NATO semi-automatic pistol
- AR-15 pistol stabilizing brace platform
- M-LOK rifle or carbine platform
Suggested Accessories
- Magazines for AR-15 platforms
- Weapon light
- Sling
- Optic mounts
Frequently Asked Questions
What caliber is the Sig Sauer M400-Forge Pistol chambered in?
It is chambered in 5.56 NATO.
What barrel setup does this pistol use?
The M400 FORGE PISTOL has an 11.5 in cold hammer forged steel barrel with a 1:7 twist rate and an A2 Birdcage Flash Hider.
What sight comes on the firearm from the factory?
It includes a ROMEO-MSR GEN II sight with a 2 MOA dot.
What type of operating system and action does it use?
It is a semi-auto pistol with a carbine length direct impingement operating system.
What is included with the M400-Forge Pistol?
The listed included accessory is one 30-round polymer magazine.