Description
The Sig Sauer M400 Forge 10 Round is a complete rifle package configured for states that restrict magazine capacity. MAG5 Firearms stocks it with a 16-inch barrel, a free-float M-LOK handguard, a Magpul SL-K stock and a ROMEO MSR Gen II red dot already included.
Sig Sauer M400 Forge 10 Round Compliance and What It Changes
The barrel, receivers, handguard, stock and optic are the same parts found on the standard-capacity Forge. Only the magazine in the box differs, and the magazine well is unchanged.
Requirements vary by state and sometimes county, so confirm with your receiving FFL before ordering. Compliance lists change independently of federal law.
A Rifle That Is Ready on Day One
A bare AR-15 needs a sight before it is useful, and a decent red dot is a real expense on its own. The included ROMEO MSR Gen II makes this rifle usable on the first range trip.
That is the practical argument for a package rifle over a bare carbine at a similar price.
Sig Sauer M400 Forge 10 Round Specifications
| Manufacturer | SIG SAUER |
|---|---|
| Model | M400 Forge |
| Part Number | RM400556N16BFORGE10 |
| Caliber | 5.56 NATO |
| Capacity | 10+1 Rounds |
| Barrel Length | 16 inches |
| Receiver | Alloy, Black Anodized, Picatinny Rail |
| Handguard | M-LOK |
| Stock | Magpul SL-K Black Polymer |
| Grip | Black Polymer |
| Optic Included | SIG ROMEO MSR Gen II |
| UPC | 798681744121 |

Barrel and Free-Float Handguard
A 16-inch barrel is the practical minimum for a rifle without NFA paperwork, and it keeps 5.56 running at the velocities the cartridge was designed around.
The free-float M-LOK handguard does not touch the barrel, so a sling or bipod load does not shift point of impact on the Sig Sauer M400 Forge 10 Round. Slots take lights and hand stops directly.
Stock, Grip and Optics Mounting
A Magpul SL-K stock adjusts for length of pull, so the rifle fits a shooter in shirtsleeves and the same shooter in a plate carrier without swapping parts.
A continuous top rail keeps the included optic in plane with a magnifier or a night vision device if either gets added later.
Availability and Transfer
MAG5 Firearms is a licensed FFL dealer in Pennsylvania. This rifle ships new in the factory box with the magazine, the optic and SIG documentation, transferred through your local FFL.
Standard-capacity versions of the Sig Sauer M400 Forge 10 Round in Moss Green and Concrete Gray are cataloged separately.
Other Sig Sauer M400 Forge 10 Round rifles and complete AR packages are listed in our rifle catalog. Factory specifications are published by SIG SAUER.
Every Sig Sauer M400 Forge 10 Round sold by MAG5 Firearms ships new in the factory packaging with the accessories SIG SAUER includes, and transfers to your chosen FFL. The Sig Sauer M400 Forge 10 Round is a regulated firearm and we verify licensing before any order leaves the shop.



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