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This is the factory replacement magazine SIG Sauer designed specifically for the MCX-Spear platform. If you own an MCX-Spear and want a reliable spare or need to stock up, this is the magazine engineered to work across multiple calibers. The magazine holds 20 rounds in a double-stack configuration and will feed .277 Sig Fury, 6.8x51mm, 6.5 Creedmoor, or 7.62 NATO without requiring any changes. That flexibility is the whole point of the MCX-Spear platform, and this magazine delivers it.
SIG engineered this magazine for the U.S. Army's Next Generation Squad Weapon System, which means it was designed to withstand extreme conditions and perform reliably when it matters. The heat-treated steel body resists corrosion, and the precision-engineered feed lips are built to handle the demands of switching between calibers. An anti-tilt follower ensures smooth, consistent feeding regardless of which round you're running through it. The double-stack design maximizes the number of rounds while keeping the magazine profile manageable.
The magazine includes numbered side witness holes so you can see exactly how many rounds you have loaded without removing the mag. It accepts cartridges up to 2.850 inches overall length and features a steel baseplate that matches the quality of the rest of the magazine. The coyote tan finish matches the MCX-Spear's standard color scheme and blends well with typical field gear.
This magazine performs best when maintained and fed quality ammunition. Like any precision magazine, keeping the feed lips clean and the spring under normal conditions will ensure long-term reliability. The 20-round capacity strikes a balance between round count and practical handling. Whether you're training at the range or keeping a field-ready rifle, having factory magazines that actually match your rifle's capabilities removes one variable from the equation.
Yes, this is a true multi-caliber magazine that works with .277 Sig Fury, 6.8x51mm, 6.5 Creedmoor, and 7.62 NATO. You can load and feed any of these calibers without swapping magazines, which is one of the main selling points of the MCX-Spear platform. The magazine was engineered with an anti-tilt follower to handle the dimensional differences between these rounds.
The side witness holes are numbered and let you see exactly how many rounds are loaded in the magazine at a glance without removing it from the mag well or the rifle. This is useful when reloading at the range or in the field so you know when you're getting low on ammunition.
Yes, this is the factory magazine designed and manufactured by SIG Sauer specifically for the MCX-Spear. SIG engineered it for the U.S. Army's Next Generation Squad Weapon System, and it comes with SIG Sauer's Infinite Guarantee, which is fully transferable with no receipt or warranty card needed.
While the magazine uses an SR-25 pattern, it's engineered specifically for the MCX-Spear platform and may not feed reliably in other rifles. The MCX-Spear's geometry and feed system were designed to work with these magazines, so compatibility with other platforms isn't guaranteed. If you own an MCX-Spear, use factory MCX-Spear magazines for the best results.
| UPC | 798681707904 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG-SPEAR-MULTI-COY |
| Caliber/Gauge | .308 / 7.62 NATO |
| Capacity | 20 |
| Color | Coyote |
| Model | |
| Product Type | Magazine |
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