Sig Sauer M400
About the Sig Sauer M400
The Sig Sauer M400 is Sig Sauer’s mainline AR-pattern rifle, chambered in 5.56 NATO/.223 Remington with 11.5" or 16" barrels and a 30-round magazine, in finishes from black and flat dark earth to green and a rose-gold two-tone. Several configurations ship with a Sig Sauer Romeo5 red dot pre-mounted, and SDI (pistol-brace) versions are available alongside standard rifles. Ask Miami Guns which M400 configuration and optic package they currently have.
Full Specs
| Caliber | 223 Remington |
| Capacity | 30 Rounds |
| Action Type | Semi-automatic |
| Barrel Length | 16" |
| Weight | 155 oz |
| Color / Finish | Flat Dark Earth |
Specs shown are for the most common configuration in stock. See all available configurations →
Available Configurations
Miami Guns currently carries the Sig Sauer M400 in the following configurations. Tap a row to see a larger photo, and use the price button at the top of the page to check current pricing and availability.
Sig Sauer
Sig Sauer traces its roots to Swiss and German gunmaking traditions going back over a century, with its modern U.S. operations headquartered in New Hampshire. The P320 serves as the U.S. military's official M17/M18 sidearm, and Sig's broader lineup spans everyday-carry pistols, precision rifles, and modern sporting rifles.
Shop All Sig Sauer →How Buying Works at Miami Guns
Check price & availability"See Price" opens current pricing and live in-stock inventory in our online store (or call us directly if a listing has no online link).
Choose where to pick upPick up at our Hialeah location serving the Miami area, or choose from over 2,000 other pickup locations nationwide.
Complete your background check & pick upWhen your order arrives, go in person to your chosen pickup location to complete the required background check (ATF Form 4473) and take it home.
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Frequently Asked Questions
Yes — tap "See Price" above to check live availability in our online store and place your order. You can pick it up at our Hialeah location serving the Miami area, or at one of over 2,000 other pickup locations nationwide. If a listing has no online link, call us and we'll check stock directly.
A valid government-issued photo ID and a passed background check (ATF Form 4473), completed in person when you pick up your firearm. Firearms are never shipped to your home, so the same process applies at every pickup location.
It depends on your needs and comfort with the platform — our staff can walk you through fit and carry considerations in-store. For permit requirements, see our Concealed Carry Permit page.