The Sig Sauer M400 FORGE is a 5.56 NATO AR-style pistol built for precision and reliability. Features an 11.5″ barrel, Magpul stabilizing brace, and Romeo-MSR red dot for versatile sporting and recreational shooting.
The Sig Sauer M400 FORGE 5.56 NATO AR pistol delivers professional-grade performance in a compact, highly configurable platform. This semi-automatic AR-style pistol chambers 5.56 NATO ammunition and feeds from a 30-round magazine. Additionally, the 11.5″ barrel strikes an excellent balance between velocity and maneuverability for both indoor and outdoor shooting applications.
Furthermore, this M400 FORGE model arrives equipped with factory-installed features that shooters expect from Sig Sauer. The Magpul pistol stabilizing brace provides comfortable control and improved accuracy. Moreover, the Romeo-MSR Gen II red dot sight offers a crisp 2 MOA reticle for quick target acquisition at distance.
Compact AR Platform Design
The 11.5″ barrel keeps overall length manageable without sacrificing ballistic performance. In addition, the AR-platform design allows endless customization through standard accessories and aftermarket components. Therefore, this M400 FORGE grows with your needs as your skills develop.
Performance for Sporting and Recreation
Whether you shoot 3-gun competitions, train at the range, or enjoy recreational shooting, the M400 FORGE handles the mission. The 30-round capacity and 5.56 NATO caliber make it ideal for high-round-count practice sessions. Indeed, the matte black finish resists glare and shows professional aesthetics on any range.
Next, the factory red dot and stabilizing brace combination reduces setup time. You can begin accurate shooting immediately out of the box. Finally, semi-automatic operation ensures reliable cycling across a wide range of ammunition types and conditions.
Ordering from Western Sport
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: Is the Romeo-MSR red dot included with the M400 FORGE?
A: Yes. The Sig Sauer M400 FORGE ships with the Romeo-MSR Gen II red dot mounted and ready to use. This eliminates the need to source an optic separately.
Q: What is the Magpul pistol stabilizing brace, and how does it help accuracy?
A: The Magpul pistol stabilizing brace is a wrist attachment that improves control and reduces shooter fatigue during extended sessions. It enhances sight picture stability, particularly when shooting from a supported position or bench.
Q: How does the federal transfer process work for AR pistols in Texas?
A: As a licensed FFL dealer, Western Sport handles all federal background checks and paperwork required under Texas and federal law. Send us a message to discuss transfer procedures specific to your situation.
Q: What shooting applications is the M400 FORGE best suited for?
A: The M400 FORGE excels in sporting competitions, recreational range shooting, and high-round-count training. The 11.5″ barrel, red dot, and 30-round capacity make it ideal for shooters who want accuracy and speed.
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