SIG SAUER MCX SPEAR Semi-Auto SBR RSPEAR6816BNG — Description

The SIG SAUER MCX SPEAR RSPEAR6816BNG is a premium semi-automatic SBR (Short-Barreled Rifle) chambered in 6.8x51mm NATO / .277 SIG FURY, representing the next generation of SIG Sauer’s MCX modular rifle platform. Designed around advanced military-inspired technology, the MCX SPEAR combines increased cartridge performance with a compact 13-inch configuration, short-stroke gas piston operation, and a highly adaptable design.

The MCX SPEAR features a 13-inch barrel, Coyote Tan finish, collapsible/folding stock system, and a lightweight free-floating M-LOK handguard. The rifle incorporates a rotating bolt system, adjustable gas piston, fully ambidextrous controls, and both rear and non-reciprocating side charging handles for enhanced ergonomics and operational flexibility.

Built as a modular platform, the MCX SPEAR supports caliber flexibility within the SPEAR family, including 6.8x51mm, 7.62x51mm NATO, and 6.5 Creedmoor configurations (depending on conversion components). The 6.8x51mm chambering provides increased ballistic performance compared with traditional intermediate cartridges, while the compact SBR configuration offers maneuverability for specialized applications.

SIG SAUER MCX SPEAR RSPEAR6816BNG — Specifications

Manufacturer: SIG SAUER
Model: MCX SPEAR
Model Number: RSPEAR6816BNG
Caliber: 6.8x51mm NATO / .277 SIG FURY
Action: Semi-automatic
Operating System: Short-stroke gas piston with rotating bolt
Platform: SIG MCX SPEAR modular rifle system
Barrel Length: 13 inches
Barrel Twist Rate: 1:7″
Finish: Coyote Tan finish
Receiver Material: Aluminum
Handguard: Free-floating reinforced M-LOK handguard
Stock: Collapsible/folding stock system
Charging Handle: Rear charging handle plus non-reciprocating side charging handle
Trigger: SIG 2-stage Match-Duo trigger
Magazine Type: Detachable rifle magazine
Magazine Capacity: 20 rounds
Controls: Fully ambidextrous safety, bolt catch, and magazine release
Gas System: Two-position adjustable gas piston
Overall Length: Approx. 35 inches
Weight: Approx. 8.6 lbs (configuration dependent)

Key Features

• 6.8x51mm NATO / .277 SIG FURY chambering for enhanced ballistic performance
• 13-inch SBR configuration for improved maneuverability
• Short-stroke gas piston system for reliable operation
• Coyote Tan finish with premium MCX SPEAR styling
• Collapsible and folding stock for compact storage and transport
• Fully ambidextrous controls for versatile operation
• Non-reciprocating side charging handle plus standard rear charging handle
• Free-floating M-LOK handguard for accessory mounting
• SIG 2-stage Match-Duo trigger
• Adjustable gas piston system
• Modular MCX architecture supporting caliber conversions
• 20-round magazine capacity

Package typically includes:

• SIG SAUER MCX SPEAR 6.8x51mm SBR
• Folding/collapsible stock assembly
• 20-round magazine
• Owner’s manual and safety documentation