Current order processing time: 1 business day!

Welcome to Osage County Guns

Sig Sauer M400 Elite Pistol 9" .300 Blackout w/ Stabilizing Brace

Ask a question

Availability: Out of stock

Quick Overview

Sig Sauer M400 Elite Pistol, .300 Blackout, 9" BBL, 30rd, Pistol Stabilizing Brace



THE SIGM400 SERIES TACTICAL PISTOL, designed for use in law enforcement, military operations, or the sporting field as well as competitive shooting. The SIG M400 is a true AR platform tactical pistol. Provides unparalleled accuracy, a 9" barrel that provides maximum durability and corrosion resistance. A 7075-T6 aircraft grade aluminum forged lower receiver adds to the durability and reliability.

- Direct impingement gas operating system with rotating locking bolt
- Aluminum KeyMod Handguard
- Accepts most M16 type magazines

Includes the NEW SB15 Pistol Stabilizing Brace
The SB15 dramatically improves the single-handed performance of buffer tube equipped pistols.

• Fits all pistols equipped with an AR-style buffer tube 1.0" - 1.2" in diameter.
• ATF compliant
• Veteran designed
• Made in USA
• Quick and easy to install

* ATF has reviewed this product and determined that attaching the SB15 to a firearm does not alter the classification of the firearm or subject the firearm to NFA control.


Additional Information

UPC Code 798681513772
Caliber .300 Blackout
Manufacturer Sig Sauer
Sights (detailed) Flip-Up
Grips Polymer
Frame Finish Black
Barrel Length (in) 9 in
Mag Capacity / Rounds 30rd
Number of Mags 1
Accessory Rail Yes
FFL Requirements All firearms must be shipped to a Federal Firearms License (FFL) holder. We cannot and will not ship firearms to anyone but a FFL. We must receive the receiving dealer's FFL by fax (314-558-8429) or email ([email protected]).
Warranty Warranty provided by Sig Sauer. Warranty information is available for Sig Sauer products at

Product Questions

Product Questions

No Questions

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.

Customer Reviews

My Go To Weapon Of Choice. Review by Friendly Parson
Bought my M400 on advice from a dealer. Immediately took the gun to the range. The trigger pull was horrific. Other than the trigger pull, the gun was exactly what I needed. Have since added some bells and whistles, and replaced the trigger with a two stage 3 pound pull. This gun is reliable, accurate, easy to operate, and easier to clean. With a suppressor, gun is perfect for home defense, and for reducing the feral hog population. Now, everyone wants to shoot my gun. Not much noise, hardly any recoil, and extremely stable platform. (Posted on 8/1/2017)

Write Your Own Review

You're reviewing: Sig Sauer M400 Elite Pistol 9" .300 Blackout w/ Stabilizing Brace

How do you rate this product? *

  1 star 2 stars 3 stars 4 stars 5 stars