Description
The PMAG M3 for Long-Range Rifles
Magpul's PMAG 20 LR/SR GEN M3 comes purpose-built for SR25 and M110 pattern rifles in 7.62×51 NATO. This 20-rounder sits somewhere between practical capacity and shooting comfort, hitting the sweet spot for those who want reliability without the weight and bulk of a 30-round mag. The polymer body is next-generation impact and crush-resistant, meaning these magazines handle the field better than older designs while staying light enough you'll actually want to carry them.
Internal Geometry That Works
Inside the magazine, Magpul engineered things to work together. The constant-curve internal geometry pairs with an anti-tilt, self-lubricating follower and long-life stainless steel spring to ensure round after round feeds clean. The self-lubricating follower keeps things running without needing babying between uses. Service life mirrors what you'd get from your rifle barrel itself, so these magazines stand up to the same work.
Magazine You'll Actually Use
The flared floorplate makes loading and extraction straightforward, and it breaks down with zero tools required. Low-profile ribs and aggressive texturing on the front and rear give you positive control when you're working the magazine in or out of your rifle, whether you're at the range or in less ideal conditions. A paint-pen dot matrix on the bottom lets you mark each magazine for load identification. The included snap-on dust cover protects your top rounds during storage and transit without getting in the way at the range.
Key Specifications
- Caliber: .308 Winchester / 7.62×51 NATO
- Capacity: 20 rounds
- Material: Polymer body with stainless steel spring
- Follower Type: Anti-tilt, self-lubricating
- Internal Geometry: Constant-curve
- Compatible Platforms: SR25, M110, AR-10, DPMS LR, LaRue OBR pattern rifles
- Finish: Medium Coyote Tan
- Floorplate: Flared, easy-to-disassemble
- Disassembly: Tool-less
- Included Accessories: Snap-on impact/dust cover
- Manufacturer: Magpul Industries
- Manufacturer Part Number: MAG291-MCT
- UPC: 840815123095
- Weight: Less than half the weight of standard steel magazines
What’s Included
- 1x PMAG 20 LR/SR GEN M3 magazine (.308/7.62 NATO, 20-round)
- 1x Snap-on impact/dust cover
Frequently Asked Questions
Will the PMAG M3 work in my AR-10 or AR-308?
Yes, the PMAG 20 M3 is designed specifically for SR25 and M110 pattern rifles, which includes most AR-10 and AR-308 platforms. It's also compatible with DPMS LR and LaRue OBR pattern rifles. Just check your specific rifle's compatibility if you're unsure, but most modern AR-10 pattern guns run these without issue.
How does this magazine compare to steel magazines?
This PMAG weighs less than half what standard steel magazines do, so your rifle will be noticeably lighter during long days at the range or in the field. The polymer construction is impact and crush-resistant, holding up to abuse that would dent steel. You'll get comparable reliability and durability, with the added bonus of carrying less weight.
Can I take this magazine apart to clean it?
Yes, the flared floorplate disassembles without tools in seconds. You can easily access the inside for cleaning or spring maintenance. Most people find this a nice feature when they want to keep their magazines in top shape without breaking out a toolkit.
What makes the M3 generation better than older PMAGs?
The GEN M3 brought refined internal geometry and improved follower design compared to earlier generations. The constant-curve geometry combined with the anti-tilt, self-lubricating follower makes feeding more consistent across different rifles and ammunition types. It's basically Magpul's most mature design for 7.62 magazines.





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