Sig Sauer M400 5.56 NATO – New

Sig Sauer M400 5.56 NATO AR-15 Rifle for Sale

The Sig Sauer M400 chambered in 5.56 NATO is a premium AR-15 platform engineered for reliability, accuracy, and versatility. Built to Sig Sauer's exacting standards, the M400 combines modern features, durable construction, and exceptional performance, making it an excellent choice for home defense, recreational shooting, competition, and professional use.

This new Sig Sauer M400 features a free-floating M-LOK handguard, flat-top receiver with full-length Picatinny rail, adjustable Magpul stock, threaded barrel with flash hider, and comes equipped with a Sig Sauer Romeo red dot optic for rapid target acquisition right out of the box.

Whether you're purchasing your first AR-15 or adding another quality rifle to your collection, the Sig Sauer M400 delivers dependable performance backed by one of the most respected names in the firearms industry.

Features

• Manufacturer: Sig Sauer
• Model: M400
• Caliber: 5.56 NATO
• Condition: New
• Semi-Automatic Rifle
• Direct Impingement Operating System
• Free-Float M-LOK Handguard
• Full-Length Picatinny Top Rail
• Sig Sauer Romeo Red Dot Optic
• Threaded Barrel
• A2 Flash Hider
• Adjustable Magpul Stock
• Magpul Pistol Grip
• Forged Aluminum Upper & Lower Receivers
• AR-15 Platform
• Made in the USA

Why Choose the Sig Sauer M400?

The Sig Sauer M400 has earned an outstanding reputation for quality, reliability, and out-of-the-box performance. Built with premium components and modern features, it is ready for nearly any application.

Ideal for:

• Home Defense
• Recreational Shooting
• Tactical Training
• Competition
• Ranch & Property Protection
• Target Shooting

With its lightweight handling, dependable operation, and premium factory features, the M400 is one of the most trusted AR-platform rifles on the market.

Built for Accuracy and Reliability

The M400 is designed to provide consistent performance under demanding conditions. Its free-floating handguard enhances accuracy by minimizing barrel interference, while the M-LOK attachment system allows shooters to easily customize the rifle with lights, bipods, grips, and other accessories.

Combined with the included Sig Sauer Romeo red dot optic, the rifle is ready for fast, accurate shooting right out of the box.

Why Choose 5.56 NATO?

The 5.56 NATO cartridge remains one of the most popular rifle calibers in America thanks to its:

• Flat trajectory
• Low recoil
• Excellent accuracy
• Wide ammunition availability
• Proven defensive and sporting performance

Its versatility makes it an outstanding choice for both new and experienced shooters.

Why Buy From Quick Draw Gun?

At Quick Draw Gun, we proudly offer quality new and used firearms backed by knowledgeable customer service, competitive pricing, and fast shipping. Every firearm is carefully inspected so you can purchase with confidence.

Frequently Asked Questions

Is this Sig Sauer M400 new?

Yes. This rifle is new.

What caliber is the Sig Sauer M400 chambered in?

The M400 is chambered in 5.56 NATO and can also safely fire most .223 Remington ammunition.

Does this rifle include an optic?

Yes. This rifle comes equipped with a Sig Sauer Romeo red dot optic, providing fast target acquisition and enhanced shooting performance.

Does the M400 feature an M-LOK handguard?

Yes. The rifle includes a free-floating M-LOK handguard, allowing for easy customization with compatible accessories.

Is the Sig Sauer M400 a good choice for first-time AR owners?

Absolutely. Its proven reliability, quality construction, excellent ergonomics, and included optic make the Sig Sauer M400 an outstanding choice for both new and experienced AR-15 shooters.