SIG Sauer M400 X-Series 5.56 Rifle – Proven 5.56x45mm Rifle

Description

The SIG Sauer M400 X-Series 5.56 is a rifle chambered in 5.56x45mm with a 16-inch barrel and a 30+1 capacity. It carries the build quality SIG Sauer is known for and is ready for the range, the field, or home defense.

SIG Sauer M400 X-Series 5.56 Overview

The SIG M400 is SIG Sauer’s direct-impingement AR-15, built to mil-spec patterns so it works with the huge world of AR accessories. It features a forged upper and lower receiver, a free-floating M-LOK handguard, and the ergonomic upgrades SIG has refined over years of military and law enforcement contracts.

Carry and Use

The M400 is at home at the range, in a patrol car, or in the field. Its flat-top receiver accepts any optic, and the M-LOK handguard has space for lights, lasers, and grips.

Trigger and Controls

The M400 uses a standard AR-15 trigger group and familiar controls, including an ambidextrous safety selector on many models. The free-floating handguard keeps pressure off the barrel for consistent accuracy.

Sights and Optics

The flat-top receiver or rail accepts the optic of your choice, from a red dot to a magnified riflescope, so you can set it up for the way you shoot.

Caliber

The 5.56 NATO cartridge is light, flat shooting, and easy to control, and the rifle also handles .223 Remington ammunition. It is the standard round for AR-15 rifles, and ammunition is widely available.

Why SIG Sauer

SIG Sauer traces its roots back more than 150 years, and its pistols and rifles are carried by the U.S. military, federal agencies, and police departments across the country. That track record means proven designs, quality materials, and strong support for parts and accessories.

Factory Features

Here is how this model is configured from the factory:

• Black FNC Chrome Moly Steel Barrel
• Black Anodized Aluminum Receiver
• 15″ M-LOK Handguard
• Synthetic Magpul SL-K Stock
• Black Polymer Grip

In the Field

The SIG Sauer M400 X-Series 5.56 is ready for the range, the field, or home defense. With 30 rounds on board, you have plenty of capacity. Pair it with a quality optic, sling, and case and it is ready to go. Mount a quality optic, zero it at your preferred distance, and the rifle will reward you with consistent groups. A sling and a hard case make it easy to transport to the range or the field.

Specifications

• Model: M400 X-Series
• Caliber: 5.56x45mm
• Barrel Length: 16″
• Capacity: 30+1
• Manufacturer SKU: RM400SDI16BP
• Distributor Item: SS 150132
• UPC: 798681664634

Learn more about SIG Sauer firearms at SIG Sauer.

Care and Cleaning

Cleaning is straightforward. Unload the rifle, field-strip it according to the manual, clean the bore with a brush and patches, wipe carbon from the bolt and chamber, and apply a light coat of quality gun oil to the contact points. Wipe the exterior with a lightly oiled cloth before storage.

Before You Buy

Federal law requires firearm purchases to go through a licensed dealer with a background check, and buyers must be 18 or older to purchase a rifle. Some states and localities restrict magazine capacity and certain features, so check your local laws before you order. We ship to the FFL dealer of your choice, and your dealer handles the background check and transfer.

Who It Is For

The SIG Sauer M400 X-Series 5.56 is built for shooters who want a dependable, accurate rifle from one of the most respected names in the industry.

Buy the SIG Sauer M400 X-Series 5.56 at MAG5 Firearms

MAG5 Firearms is based in Collegeville, Pennsylvania, and ships to licensed dealers across the country. Order the SIG Sauer M400 X-Series 5.56 online, choose your FFL at checkout, and we will handle the rest. You can also browse our full selection of rifles. If you have questions about accessories, our team is happy to help.