SIG M400 ENHANCED for Sale

Quick Look

The SIG M400 Enhanced is a direct-impingement AR-15 platform introduced by SIG Sauer to offer improved performance and reliability in a civilian-legal rifle. Designed with premium components and careful attention to tolerances, it provides a high-performance edge right out of the box. The M400 Enhanced remains a popular mid-tier option for shooters seeking dependable performance with SIG engineering behind it.

Why It's a Top Choice

• Free-floating barrel enhances accuracy and consistency
• Premium SIG-made lower and upper receivers
• Comes optics-ready with flat-top rail
• Chrome-lined barrel with 1:7 twist handles various loads
• Minimal recoil with solid reliability under rapid fire

Key Variants

SIG M400 Tread

Entry-level variant with modular upgrades and affordable customization for newer AR owners.

SIG M400 Elite

Premium build with enhanced furniture and controls for serious tactical or duty use.

SIG M400 DH3

Competition-focused model co-developed with shooter Daniel Horner for 3-gun applications.

Competitor Comparison Table

Best Use Cases

• Home defense
• Range training
• 3-gun competition
• Truck or ranch rifle
• AR collection or upgrade platform

FAQs

What is the barrel twist rate on the SIG M400 Enhanced?

The factory barrel twist is 1:7, ideal for stabilizing heavier 5.56 NATO rounds.

Can I run .223 Remington in the SIG M400 Enhanced?

Yes, its 5.56 NATO chamber safely handles both .223 Remington and 5.56 NATO loads.

How does the SIG M400 Enhanced compare to mil-spec ARs?

It offers better fit, finish, and features like a free-float handguard over most basic mil-spec models.