Sig Sauer M400 Pistol for sale
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Sig Sauer SIGM400 Tread 5.56 NATO Pistol - PM400-11B-TRD
Brand:
Sig Sauer
Action:
Semi-Auto
Barrel Length:
11.5"
Caliber:
.223 Rem/5.56×45mm NATO
Capacity:
30
Finish Per Color:
Black
Marketplace Insights
★ 4.7/5
based on 7 customer reviews across 1 variants from 7 retailers
Highly-rated accurate and well-built AR pistol with excellent performance, though users commonly replace the stock brace and add sights.
What customers like
Accuracy and Performance86%
Delivers accurate grouping and is very customizable.
Build Quality71%
Well built and reliable while it's nothing fancy
Tight Fit and Feel57%
Nice solid feel in the hands with a good, tight fit
Reliability29%
Good mechanical function with no errors.
Common concerns
Stock/Brace Quality43%
Brace is thin and nearly useless
Missing Sights29%
I wish it had come with some sights.
Frequently Asked Questions
Sig Sauer M400 Pistol for sale
Is the Sig Sauer M400 a good gun?
Whether it's good depends on your needs. Reviewers praise the M400 Tread for reliability, accuracy, and ease of use, making it popular with beginners and range shooters. It's chambered in 5.56 NATO with a 30-round capacity. Typically around $1,000, it offers solid value as a mid-level AR platform rifle.
How much does a M400 cost?
The SIG Sauer M400 line varies widely by variant. The M400 Tread can be found around $901.99, while the M400 SDI pistol runs $1,499.99 and the M400-DH3 reaches $1,599.99. The current average new price is approximately $1,149.52. It is a 5.56 NATO semi-automatic platform.
Is the SIG Sauer M400 an AR-15?
Yes, the SIG Sauer M400 is built on the AR-15 platform. It uses a direct impingement operating system and accepts standard AR-15 components. The M400 Tread variant is chambered in 5.56 NATO, semi-automatic, and designed for range shooting and home defense.
Is the SIG M400 a 556 or 223?
The SIG M400 is chambered in 5.56 NATO, which also safely accepts .223 Remington ammunition. The reverse is not true—a rifle chambered only in .223 should not fire 5.56 NATO rounds due to higher pressure. The M400 handles both without issue.
Where is SIGM400 made?
SIG Sauer manufactures the M400 in the United States, primarily at their facility in Newington, New Hampshire.
Does the SIG Sauer M400 tread have a threaded barrel?
Yes, the SIG Sauer M400 Tread has a 16-inch threaded stainless steel barrel with a 1:8 twist rate. It comes with a 3-prong flash hider installed and accepts suppressors or other muzzle devices via standard threading.