Sig Sauer Magspearmulticoy Mcx-Spear 20Rd Double Stack 277 Fury/6.8X51Mm/6.5 Creedmoor/7.62 Nato Coyote Tan Steel

The Sig Sauer MCX-Spear 20-round magazine is a multi-caliber, double-stack steel mag built for shooters who demand versatility and rugged reliability. Engineered for the MCX-Spear platform—Sig's civilian evolution of the U.S. Army's Next Generation Squad Weapon System—this magazine accepts four rifle calibers: .277 SIG FURY, 6.8x51mm, 6.5 Creedmoor, and 7.62 NATO. That multi-caliber compatibility makes it genuinely useful if you're running different uppers or building out an adaptable rifle setup without juggling separate magazine inventories.

Built from steel with a steel baseplate, this mag is engineered to handle serious use. The double-stack design keeps the profile manageable while feeding 20 rounds downrange, and the round limit (up to 2.850 inches in length) accounts for the longer cases and velocities these cartridges demand. Side witness holes let you see your round count at a glance—handy on the range or in the field when you need to know what you've got left without breaking your shooting position.

The coyote tan finish blends into most modern setups and resists corrosion better than bare steel. Whether you're running an MCX-Spear in one caliber or stocking mags for multiple uppers, this is solid factory equipment that delivers the durability Sig built into the rifle itself. No guessing, no compromises—just a magazine that does its job and then some.

Key Features

• Multi-caliber compatibility: feeds .277 SIG FURY, 6.8x51mm, 6.5 Creedmoor, and 7.62 NATO
• 20-round double-stack capacity
• Steel construction with steel baseplate for durability
• Side witness holes for quick round-count visibility
• Designed to work with suppressors
• Coyote tan finish for corrosion resistance
• Engineered for the MCX-Spear platform

Specifications

Frequently Asked Questions

Will this magazine work with other rifle platforms or only the MCX-Spear?

This magazine is designed for the MCX-Spear platform. While it's engineered to feed multiple calibers (.277 SIG FURY, 6.8x51mm, 6.5 Creedmoor, and 7.62 NATO), compatibility with other rifles depends on their magazine wells and feeding systems. Confirm fit with your specific platform before relying on it in the field.

Can I use this magazine with a suppressor?

Yes. This magazine was specifically engineered to perform with a suppressor on the MCX-Spear.

What calibers does this magazine accept?

The MCX-Spear magazine feeds .277 SIG FURY, 6.8x51mm, 6.5 Creedmoor, and 7.62 NATO. Rounds must not exceed 2.850 inches in length.

What's included when I buy this magazine?

You receive the 20-round double-stack magazine with steel construction and coyote tan finish. The magazine ships ready to use—no assembly required.