Sig Sauer M400 Pro Rifle WRM400-556N-16B-PRO, 5.56 NATO, 16″, Collapsible Stock, Black Finish, 30 Rds

SIG SAUER M400 PRO Rifle – 5.56 NATO, 16″ Barrel, Collapsible Stock, Black Finish, 30-Round

The SIG SAUER M400 PRO WRM400-556N-16B-PRO is a premium semi-automatic rifle chambered in 5.56 NATO, designed as a high-performance AR-platform rifle with enhanced features for professional, defensive, training, and recreational applications. Built around SIG SAUER’s proven M400 architecture, the M400 PRO combines a lightweight design with upgraded controls, a free-floating handguard, and precision-focused components.

Featuring a 16-inch cold hammer forged barrel, the M400 PRO delivers a balance of accuracy, durability, and maneuverability. The rifle uses a direct gas impingement operating system, a lightweight aluminum receiver, and a free-floating M-LOK handguard for improved accessory mounting and consistent barrel performance.

The M400 PRO configuration includes a 6-position collapsible stock, flip-up sights, fully ambidextrous controls, and a 30-round magazine. Designed with input from professional users, the rifle provides enhanced ergonomics and a refined shooting experience while maintaining compatibility with common AR-style accessories.

Specifications

Key Features

• Chambered in 5.56 NATO
• Full-length 16-inch cold hammer forged barrel
• Proven direct impingement gas system
• Lightweight aluminum receiver construction
• Free-floating M-LOK handguard
• Fully ambidextrous controls
• 6-position collapsible stock
• Folding backup sights included
• Enhanced trigger system
• Full-length optics rail
• AR-15 magazine compatibility
• 30-round magazine capacity
• Designed for professional and general-purpose rifle applications

The SIG SAUER M400 PRO 5.56 NATO Rifle offers a refined AR-style platform with premium upgrades, combining SIG SAUER reliability, lightweight handling, and enhanced ergonomics in a versatile 16-inch rifle configuration.