The Sig Sauer MCX Spear in .277 Fury/6.8x51mm (brand part no. RSPEAR6816BNG) pairs a 16-inch barrel with a fast 1-in-7 twist, delivering the next-generation intermediate cartridge in a select-fire-pattern civilian rifle. Sig Sauer finishes this rifle in Coyote, ships it with an included 20-round steel AR-10-pattern magazine, and mounts it optic-ready with an ambidextrous safety lever. The rifle measures 38.3 inches overall and ships at approximately 11.6 pounds. Among AR-platform rifles in the AR rifles category, the MCX Spear favors shooters who want Sig’s flagship hybrid-case cartridge in a proven MCX platform.

Key Specifications

• Chambered in .277 Fury/6.8x51mm.
• Rifled at a 1-in-7 rate of twist.
• Features a 16-inch barrel.
• Ships with an included 20-round steel AR-10-pattern magazine.
• Includes an ambidextrous safety lever.
• Ships optic-ready.
• Overall length is 38.3 inches.
• Ships at approximately 11.6 pounds.
• Finished in Coyote.

Frequently Asked Questions

What is .277 Fury? Sig Sauer’s hybrid-case intermediate cartridge, also marketed as 6.8x51mm, built for higher pressure and better long-range performance.

What magazine ships with this rifle? An included 20-round steel AR-10-pattern magazine.

Buy the Sig Sauer MCX Spear .277 Fury

Sig’s flagship hybrid-case cartridge in a proven MCX platform is exactly what the Spear delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.