The SIGM400 Tread: 5.56 NATO, 16" Semi-Auto Rifle - Black is a 5.56 NATO ar style rifles from Sig Sauer. It is available from 1 vendor at $1200.99.
Name: SIGM400 Tread: 5.56 NATO, 16" Semi-Auto Rifle - Black
Brand: Sig Sauer
Category: AR Style Rifles
Caliber: 5.56 NATO
Barrel Length: 16"
Capacity: 10 rounds
UPC: 798681632954
SKU: UCE3nOjlq
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AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
The SIGM400 is a direct-impingement semi-automatic rifle chambered in 5.56 NATO/.223 Remington. It has a 16-inch barrel, weighs 7 lbs, and ships in black. The 1:8 twist rate stabilizes a wide range of bullet weights, which gives it flexibility across different load types.
The direct-impingement operating system is mechanically simple, which keeps parts count low and maintenance straightforward. The 16-inch barrel hits the legal minimum for a non-SBR configuration while keeping overall length at a manageable 30.8 inches. At 7 lbs, it's neither ultralight nor heavy for the AR-15 platform.
The 1:8 twist handles bullets in the 55-77 grain range reliably, so users aren't locked into a single load weight. The black finish resists corrosion and wear under typical use conditions.
The SIGM400 fits common AR-15 use cases: home defense, range shooting, and light hunting. The 5.56 NATO chambering also accepts .223 Remington, which is widely available and generally less expensive. The 10-round capacity is below what the platform can accept — standard AR-15 30-round magazines are compatible depending on local regulations.
| Caliber | 5.56 NATO |
| Model | SIGM400 |
| Capacity | 10 rounds |
| Barrel length | 16" |
| Overall length | 30.8" |
| Action | Semi Auto |
| Color | Black |
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
The SIGM400 Tread gets generally favorable reviews in the AR-15 community, with accuracy and build quality as the main selling points.
Owners frequently mention that accuracy out of the box is good, with effective performance at typical rifle distances. The 1:8 twist rate flexibility and the SIG name carry weight with buyers who prioritize reliability from the factory.
Versatility is a recurring theme. Users note the platform adapts well to optics and accessories, and the standard AR-15 form factor means the aftermarket parts selection is broad. For buyers who plan to customize, the SIGM400 gives a solid base.
On the critical side, weight comes up regularly. At 7 lbs, some owners find it heavier than comparable AR-15 options from other manufacturers, which affects handling in extended carry or competition use. The 10-round factory capacity limitation also draws comment — while magazine compatibility with standard AR-15 magazines exists, shipping with a 10-round magazine is a noticeable limitation on the base configuration.
The price-to-feature ratio is discussed positively overall, with most owners considering it competitive for a SIG-branded rifle. Some mention specific components — trigger, handguard — as areas where the Tread configuration leaves room for upgrades compared to higher-end AR-15 builds.
Price Range: $1200.99 - $1200.99
| Vendor | Price | Condition | Link |
|---|---|---|---|
| Guns Com | $1200.99 | Used | Buy Now |
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