SIG Sauer MCX-SPEAR SBR 6.8×51

Overview

The SIG Sauer MCX-SPEAR SBR 6.8×51 sets a new standard for short-barreled battle rifles, combining military-proven performance, modular design, and unmatched reliability in a compact, highly maneuverable package derived from the U.S. Army's Next Generation Squad Weapon (NGSW) program.

Key Features

Advanced Caliber

Chambered in 6.8×51mm for enhanced ballistic performance compared to legacy 5.56×45mm NATO and 7.62×51mm NATO platforms.

Short-Stroke Gas Piston System

Equipped with a two-position adjustable gas valve, ensuring consistent performance whether suppressed or unsuppressed.

Fully Ambidextrous Controls

Features ambidextrous bolt catch, magazine release, and safety selector for maximum operational flexibility and ease of use.

Compact and Rugged Design

Monolithic aluminum upper receiver paired with a free-floating steel barrel for maximum strength, reduced weight, and consistent accuracy.

Folding and Adjustable Stock

The folding stock allows for compact transport while offering adjustable length-of-pull and comb height for enhanced shooter comfort.

Specifications

• Caliber: 6.8×51mm
• Barrel Length: 330mm
• Overall Length: 838mm
• Length Folded: 714mm
• Weight: 4040g
• Operating System: Short-stroke gas piston, two-position adjustable
• Material: Aluminum receiver, steel barrel
• Finish: Coyote anodized
• Magazine Capacity: 20 rounds
• Thread: 5/8×24 UNEF
• Stock: Folding, adjustable
• Compatibility: M-LOK handguard, suppressor-ready design