Sig M400 Tread AR-15 Rifle RM40016BTRD, 223 Remington/5.56 NATO, 16.5″, Magpul SLK Black Stock, Black Finish, 30 Rds

$849.99

The Sig Sauer M400 TREAD features a full length handguard that is free floated and has lightning cuts for heat ventilation. The handguard features Magpul’s

Category: sig sauer

Description
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SIG SAUER M400 TREAD AR-15 Rifle – 5.56 NATO / .223 Remington, 16″ Barrel, Magpul SL-K Stock, Black Finish, 30-Round

The SIG SAUER M400 TREAD (RM400-16B-TRD) is a semi-automatic AR-15-style rifle chambered in 5.56x45mm NATO and compatible with .223 Remington ammunition. Designed as a versatile modern sporting rifle, the M400 TREAD combines SIG SAUER reliability with a lightweight, modular configuration featuring upgraded furniture and a free-floating handguard.

This configuration features a 16-inch barrel, black finish, and a Magpul SL-K 6-position telescoping stock. The rifle uses a direct gas impingement operating system, a free-floating M-LOK handguard, and a mid-length gas system for a balanced handling profile.

The M400 TREAD includes a lightweight aluminum receiver set, AR-15 pattern controls, and a 30-round magazine configuration. It is designed to accept a wide range of aftermarket AR-compatible accessories while providing SIG SAUER factory engineering and fitment.

Specifications

Feature	Specification
Manufacturer	SIG SAUER
Model	M400 TREAD
Model Number	RM400-16B-TRD
Caliber	5.56x45mm NATO / .223 Remington
Action	Semi-Automatic
Operating System	Direct Gas Impingement
Barrel Length	16 inches (listed configuration may vary by catalog description)
Barrel Twist	1:8″ RH
Finish	Black
Receiver Material	Aluminum
Handguard	Free-Floating M-LOK
Stock	Magpul SL-K 6-Position Telescoping Stock
Trigger	Single-Stage Trigger
Magazine Capacity	30 Rounds
Magazine Type	AR-15 Pattern
Gas System	Mid-Length
Optics Mount	Full-Length Picatinny Upper Receiver Rail
Muzzle Thread	1/2×28

Key Features

Chambered in 5.56 NATO / .223 Remington
16-inch barrel
SIG M400 TREAD AR platform
Free-floating M-LOK handguard
Magpul SL-K adjustable stock
Lightweight aluminum receivers
Direct gas operating system
Mid-length gas system
AR-15 accessory compatibility
Ambidextrous controls
30-round magazine capacity

The SIG SAUER M400 TREAD 5.56 NATO Rifle is a well-rounded AR-style platform offering SIG SAUER quality, modular accessory support, and practical features for range use, training, and general-purpose shooting.