SIG SAUER M400 Rose 5.56mm 16" Romeo 5x2
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Sig Sauer
SIG SAUER M400 Rose 5.56mm 16" Romeo 5x2
The SIG SAUER M400 Rose is a purpose-built, feature-rich AR-15 platform chambered in 5.56mm NATO, combining SIG's legendary reliability with a striking aesthetic and a SIG Romeo5 X 2 MOA red dot optic package right out of the box.
- Chambered in 5.56 NATO / .223 Rem for versatile, widely available ammunition
- 16" barrel delivers optimal velocity and accuracy for mid-range shooting
- Includes SIG Romeo5 1x20mm red dot sight for fast, instinctive target acquisition
- 6-position Magpul MOE-SL collapsible stock fits a wide range of shooters
- Black anodized finish provides durable corrosion resistance and a clean look
- Ships with two 30-round polymer magazines for immediate range readiness
Who This Is For
The SIG SAUER M400 Rose is ideal for sport shooters, home defenders, and AR platform enthusiasts who want a complete, optic-ready rifle without the hassle of piecing together a build. Whether you're hitting the range for the first time or adding a reliable, optic-equipped carbine to your collection, the M400 Rose delivers exceptional value and SIG-quality performance straight from the box.
Specifications
| Model | M400 Rose |
|---|---|
| SKU / Part Number | RM400-16B-ROSE-R5X2 |
| Caliber | .223 Rem / 5.56 NATO |
| Barrel Length | 16" |
| Overall Length | 32.5" – 35.5" (stock adjusted) |
| Weight | Approx. 7.5 lbs (unloaded) |
| Action | Semi-Automatic, Direct Impingement |
| Capacity | 30+1 |
| Stock | Magpul MOE-SL 6-Position Collapsible |
| Optic Included | SIG Romeo5 1x20mm Red Dot (2 MOA) |
| Finish | Black Anodized |
| Sights | None (optic included) |
| Magazines Included | Two 30-Round Polymer Magazines |
Frequently Asked Questions
Can this rifle use both .223 Remington and 5.56 NATO ammunition?
Yes. The SIG SAUER M400 Rose is chambered for 5.56 NATO, which means it safely accepts both 5.56 NATO and .223 Remington cartridges. This gives you maximum flexibility when sourcing ammunition for training, target shooting, or home defense applications.
Is the SIG Romeo5 optic already mounted, or does it need to be installed separately?
The Romeo5 X 2 MOA red dot sight is included as part of the package, though it may need to be mounted to the rifle's Picatinny rail upon unboxing. The Romeo5 is a highly regarded compact red dot known for its MOTAC (Motion Activated Illumination) technology and 40,000-hour battery life, making it a standout addition to this package.
Does California's magazine capacity law affect this purchase at Goodland Guns?
Yes. California law currently restricts the sale of magazines holding more than 10 rounds to new purchasers. While this rifle is listed with two 30-round magazines, California-based buyers at Goodland Guns will receive compliant 10-round magazines in accordance with state law. Please consult with store staff for the most current compliance details at the time of purchase.