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The Magpul PMAG 20 LR/SR GEN M3 brings proven reliability to precision rifle platforms without the bulk. Designed specifically for 7.62×51 NATO (.308 Winchester) ammo, this 20-round mag works seamlessly with SR25, M110, and AR-10 pattern rifles. Its compact form pairs with full-size reliability, making it ideal for range work, competition shooting, or field use where you need serious capacity without overextension.
What sets the M3 apart is the engineering. Magpul built this mag around a constant-curve internal design paired with an anti-tilt, self-lubricating follower. That means rounds stack predictably from first to last, and the follower stays level under recoil or movement, eliminating feeding hiccups that plague lesser designs. The long-life stainless steel spring resists corrosion and maintains consistent tension through thousands of cycles—matching the service life of your rifle barrel itself.
The polymer body is next-generation impact and crush-resistant material, yet still weighs less than half a comparable steel magazine. Low-profile ribs and aggressive texturing on the front and rear give you solid control in any condition. The flared floorplate disassembles without tools, aiding extraction and adding drop protection, while still fitting comfortably in tight double or triple mag pouches. A paint-pen dot matrix on the bottom lets you mark loads for quick identification. The snap-on impact/dust cover keeps rounds and feed lips protected during storage and transport.
Made in the USA, this PMAG M3 carries a track record built on field testing with serious users. The design handles SAAMI-spec ammunition up to 2.820 inches OAL, so standard .308 ammo cycles without issue. Whether you're stacking mags for a range day or building a duty rifle, the PMAG 20 M3 delivers the reliability and handling you'd expect from Magpul's reputation.
Yes, the PMAG 20 LR/SR GEN M3 is designed for DPMS pattern AR-10 rifles, SR-25, and M110 style platforms. It's optimized for SAAMI-spec .308 Winchester ammo up to 2.820 inches OAL. Note that it's not compatible with M14-pattern, FN FAL-pattern, or HK 91/G3-pattern rifles.
The constant-curve design matches the natural arc of how rounds stack in the magazine, eliminating pressure points and binding that can cause feeding failures. Combined with the anti-tilt follower, this ensures smooth, reliable feeding shot after shot, even under heavy recoil or rough handling.
Yes. Magpul's next-generation impact and crush-resistant polymer is engineered for field durability while weighing roughly half what steel mags weigh. The real benefit is handling and ergonomics without sacrificing reliability. The stainless steel spring and anti-tilt follower handle the wear that matters most.
You can, but standard practice with any spring-loaded magazine is to avoid storing it fully loaded for months on end. To maximize spring life, some users prefer keeping them loaded to 15 rounds during extended storage. The impact/dust cover helps protect the magazine and rounds during transit and storage.
| UPC | 873750008509 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG291-BLK |
| Action | |
| Caliber/Gauge | .308 / 7.62 NATO |
| Capacity | 20 |
| Color | Black |
| Model | |
| Model Fit | AR-10 |
| Product Type | Magazine |
| Quantity | 1 |
| Shipping Weight | 0.41 |
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