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This is the Magpul PMAG AR-10/SR-25 20-round magazine, chambered in .308 Winchester / 7.62×51 NATO. Compatible with AR-10, M110, SR-25 platforms.

The PMAG 20 LR/SR GEN M3 brings many of the M3 improvements to the standard SR25 20-round magazine.

The 7.62×51 NATO (.308 Winchester) PMAG 20 LR/SR GEN M3 is a lightweight, cost-effective, high-reliability magazine for SR25/M110 pattern rifles featuring true 20-round capacity, constant-curve body, anti-tilt follower, and snap on Impact/Dust Cover.

Designed specifically for military-issue MK11/M110 rifles and SAAMI-spec ammunition, the PMAG 20LR/SR is less than half the weight of standard-issue steel magazines and maintains a service life round count approximately equal to the rifle barrel itself.

Made in U.S.A.


  • Optimized for use with SAAMI-spec 7.62×51/.308 Winchester ammunition
  • Additional commercial rifle compatibility includes the new Armalite AR-10A, Bushmaster .308 ORC, Colt LE901-16S, CORE Rifle Systems CORE30, DPMS LR308, JP Enterprises LRP-07, KAC SR25, LaRue OBR, Les Baer .308, LMT .308 MWS, LWRCI REPR, Mega Arms MATEN, POF P-308, Remington R-25, Ruger SR-762, S&W M&P10, SIG716, and others*
  • Next-generation impact and crush-resistant polymer construction
  • Constant-curve internal geometry for smooth feeding
  • Anti-tilt, self-lubricating follower for increased reliability
  • High-quality stainless steel spring for corrosion resistance
  • Ribbed gripping surface and new aggressive front and rear texture for positive magazine handling
  • Paint pen dot matrix panels on the bottom of the body to allow for identification marking
  • Flared floorplate aids magazine handling and disassembly yet is slim enough for use with many pouches
  • Multi-use Impact/Dust Cover minimizes debris intrusion and protects cartridges from potential damage during storage and transit

*NOTE: NOT compatible with Armalite AR-10B, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417 or any other rifles that utilize M14, FN FAL, or HK 91/G3 patterned magazines.

To accommodate longer than SAAMI-spec match ammunition, this magazine may not drop free from all makes of lower receivers.


Weight 8 oz


Manufacturer Part #




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Customer Reviews

Based on 70 reviews

All are good quality shipped quick

Ronald M.
Worked Great

Used both in my new Ruger SFAR with no issues. Installed and ejected easily. Ammo loaded easily using my MagLuLa and were stripped into battery with no issues.

Jesse T.
Gold standard for the AR10

This PMAG GEN M3 AR-10 works great in my Armalite AR-10A. Magshack is a great company that communicates well and ships fast!

Great selection and great prices

My order shipped and delivered quickly, items as described.

Phillip T.

Magpul PMAG GEN M3 AR-10 .308/7.62x51 20 Round Magazine

Magpul PMAG GEN M3 AR-10 7.62NATO 20 Round Magazine Magpul PMAG GEN M3 AR-10 7.62NATO 20 Round Magazine Magpul PMAG GEN M3 AR-10 7.62NATO 20 Round Magazine Magpul PMAG GEN M3 AR-10 7.62NATO 20 Round Magazine
Magpul Magazines

Magpul PMAG GEN M3 AR-10 .308/7.62x51 20 Round Magazine

20-round reliability
GEN M3 technology with pop-off dust-cover
Optimized for AR10, M110, and SR25 platforms
Rugged Magpul polymer



Availability: In stock

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