Sig Sauer MCX Spear-LT SBR Rifle RMCX-300B-9B-LT-SBR, 300 Blackout, 9″, Folding Stock, Coyote Finish, 30 Rd

SIG SAUER MCX-SPEAR LT SBR – .300 Blackout, 9″ Barrel, Folding Stock, Coyote Finish, 30-Round

The SIG SAUER MCX-SPEAR LT SBR RMCX-300B-9B-LT-SBR is a compact semi-automatic short-barreled rifle chambered in .300 AAC Blackout. Built on the next-generation MCX-SPEAR LT platform, this model combines SIG SAUER’s proven short-stroke piston operating system with a lightweight modular design, folding stock, and a compact 9-inch barrel configuration optimized for maneuverability and versatility.

The MCX-SPEAR LT features an aluminum receiver, short-stroke gas piston system, and rotating bolt design for reliable operation across a wide range of conditions. The platform incorporates improvements over previous MCX generations, including a lighter handguard, ambidextrous controls, and enhanced modularity.

Finished in Coyote Anodized, this configuration includes a folding stock, M-LOK aluminum handguard, full-length Picatinny top rail, SIG flatblade match trigger, and a 30-round magazine. The .300 Blackout chambering makes the MCX-SPEAR LT especially well suited for compact rifle applications where a short, maneuverable platform is desired.

Specifications

Key Features

• Chambered in .300 AAC Blackout
• Compact 9-inch barrel SBR configuration
• Advanced MCX-SPEAR LT piston-driven operating system
• Durable Coyote Anodized finish
• Folding stock for compact transport
• Lightweight aluminum receiver
• M-LOK accessory handguard
• Full-length optics rail
• Fully ambidextrous controls
• SIG flatblade match trigger
• Suppressor-ready muzzle device
• 30-round magazine capacity
• Modular MCX platform design

The SIG SAUER MCX-SPEAR LT SBR .300 Blackout combines the compact handling of an SBR with the modularity and reliability of the MCX family, offering a modern piston-driven rifle platform built for performance, adaptability, and demanding applications.