Sig Sauer M400 SDI XSeries Features
The M400 SDI XSeries is designed with an aluminum M-LOK handguard, allowing for modular accessory attachment while maintaining a lightweight feel. The Sig 2-Stage Matchlite Duo trigger ensures a crisp, consistent pull, improving precision for both competitive and defensive applications.
This rifle features an ambidextrous safety, enhancing usability for both right- and left-handed shooters. The threaded barrel (1/2×28) accommodates suppressors and other muzzle devices, while the Sig Flash Hider Compensator reduces recoil and muzzle rise. The rifle is optics-ready, featuring a flat-top upper receiver, allowing shooters to customize their sighting system to their preference.
Sig Sauer M400 SDI XSeries Specifications
- Caliber: .223 Rem | 5.56 NATO
- Action: Semi-Auto
- Barrel Length: 16″
- Overall Length: 36.5″
- Twist Rate: 1-in-7″
- Capacity: 30+1 Rounds
- Magazine: 1 x 30-Round Polymer Mag
- Finish: Flat Dark Earth
- Stock: Collapsible / Folding (Magpul SL)
- Sights: None (Optics Ready)
- Muzzle Device: Sig Flash Hider Compensator
- Thread Pattern: 1/2×28
- Safety: Ambidextrous
- Handguard: Aluminum M-LOK
- Trigger: Sig 2-Stage Matchlite Duo
- Weight: 7 lbs.
Frequently Asked Questions About This Product
Why buy Sig Sauer M400 SDI XSeries Flat Dark Earth 5.56 / .223 Rem 16" Barrel 30-Rounds from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy Sig Sauer M400 SDI XSeries Flat Dark Earth 5.56 / .223 Rem 16" Barrel 30-Rounds?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is Sig Sauer M400 SDI XSeries Flat Dark Earth 5.56 / .223 Rem 16" Barrel 30-Rounds available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: Modern Sporting Rifles, RIFLES.
What tags or features does this product have?
Key features and tags for this product include: Modern Sporting Rifles, RIFLES.
Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
FFL Transfer & Firearms Laws for Sig Sauer M400 SDI XSeries Flat Dark Earth 5.56 / .223 Rem 16" Barrel 30-Rounds
All firearms, including the Sig Sauer M400 SDI XSeries Flat Dark Earth 5.56 / .223 Rem 16" Barrel 30-Rounds, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the Sig Sauer M400 SDI XSeries Flat Dark Earth 5.56 / .223 Rem 16" Barrel 30-Rounds is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
