Home » Shop » Sig Sauer M400 FORGE, 5.56 NATO, 16″ Barrel, Black, 10 Rounds, Rmsr G2 10RD
Home » Shop » Sig Sauer M400 FORGE, 5.56 NATO, 16″ Barrel, Black, 10 Rounds, Rmsr G2 10RD
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$1,099.99Original price was: $1,099.99.$999.99Current price is: $999.99.
🚚 Ships to your local FFL — order online, put your FFL dealer’s name and address in the Order notes box at checkout, and we coordinate the rest. Most firearms ship same or next business day. How buying a gun online works.
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Sig Sauer M400 FORGE is a semi-automatic rifle chambered in 5.56 NATO with a 16" barrel and a Romeo-MSR Gen II 2 MOA red dot. It suits shooters who want a ready-to-run carbine-length setup for range days, practice and general use.
5.56 NATO, semi-automatic action
16" cold hammer forged barrel
Romeo-MSR Gen II 2 MOA red dot
3.5 lb two-stage flat blade trigger
10-round capacity
Adjustable polymer stock, matte black
SKU: SGRM400-556N16BFORGE10 · Mfr part #: RM400-556N-16B-FORGE-10 · UPC: 798681744121
The Sig Sauer M400 FORGE is a semi-automatic 5.56 NATO rifle with a 16″ barrel, a matte black finish and a Romeo-MSR Gen II 2 MOA red dot. It holds 10 rounds and has a right-handed layout with an adjustable polymer stock.
The barrel is cold hammer forged. The trigger is a TriggerTech two-stage flat blade duty trigger with a 3.5 lb pull. The handguard is aluminum, and the charging handle is ambidextrous, so left-handed shooters can run it without changing hands on the controls.
Who it suits
This rifle fits someone who wants a complete setup with an optic already on it. A red dot lets you keep both eyes open and focus on the target, which makes it easy to learn on. The two-stage trigger gives you a clear take-up before the break, which helps with controlled shots at the range. The 10-round capacity keeps it simple for casual shooting and practice.
For gear, plan on extra 5.56 NATO magazines, a two-point sling, eye and ear protection, and a rifle case for transport. A basic bore cleaning kit and a padded range bag round things out. If you shoot often, a spare red dot battery is a smart thing to keep in your range kit.
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: What caliber is the Sig Sauer M400 FORGE?
A: 5.56 NATO. It is a semi-automatic rifle with a 16" barrel.
Q: Does the M400 FORGE come with a red dot?
A: Yes. It comes with a Romeo-MSR Gen II red dot with a 2 MOA dot.
Q: Is the M400 FORGE left-hand friendly?
A: Partly. The charging handle is ambidextrous, but the rifle is listed as right-handed overall.
Q: How many rounds does the M400 FORGE hold?
A: 10 rounds. This model is the 10-round version.
Q: Is the Sig M400 FORGE any good?
A: It has a cold hammer forged barrel, a 3.5 lb two-stage flat blade trigger, an aluminum handguard and a Romeo-MSR Gen II red dot. Those features make it a solid, optic-equipped 5.56 NATO rifle.
Warranty and Manufacturer
Covered by the Sig Sauer factory warranty; warranty terms come from Sig Sauer.
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