Magpul PMAG 40 AR/M4 Gen M3 5.56 AR-15 Magazine - Black

Manufactured by Magpul Industries
Manufactured by Magpul Industries
56 Reviews

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.

Magazines considered High Capacity are controlled by the ATF and/or local jurisdictions are not available for purchase/shipment in all areas.



NOTE: GEN M3 PMAGs may not be compatible with all billet lowers without slight modification of the magazine overtravel stop.

The Magpul PMAG 40 GEN M3 is a 40-round 5.56 NATO polymer magazine for AR-15/M4 compatible weapons. This magazine features a long-life USGI-SPEC stainless steel spring, four-way anti-tilt follower and constant curve internal geometry for reliable feeding. A redesigned bolt catch notch in the rear of the magazine provides increased bolt catch clearance, while an over-travel stop on the spine helps ensure the magazine will not over-insert on compatible weapons. Slim, for better compatibility with tight magazine pouches, this easy to disassemble magazine features a flared floorplate, low profile ribs, and aggressively textured front and rear surfaces for positive control. A paint pen dot matrix on the bottom panel of the body allows easy marking for identification.

  • Impact and crush resistant polymer construction
  • Constant curve internal geometry
  • Anti-tilt, self-lubricating follower
  • Long life USGI-SPEC stainless steel spring
  • Over-travel insertion stop
  • Ribbed gripping surface
  • Aggressive front and rear texture
  • Paint pen dot matrix panels
  • Flared floorplate
  • Pop-off impact/dust cover

Magpul continues to grow and develop based on innovation, simplicity, and efficiency. At Magpul, mission driven requirements inform their product design, materials, and manufacturing, focusing on efficiency without sacrificing quality or performance.
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Caliber Gauge5.56 NATO
Magazine Capacity40
Manufacturer.Magpul Industries
PlatformAR-15 Magazines
Weight8 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

56 reviews

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Love magpul. Love having these 40 round mags. Extra fun at the range. Strong, durable and all around great product. Will buy more. And primary arms, thanks for the great experience.

awesome mag


Love the mag's 40 round capacity, except that there's no window and you can't see how many rounds remaining left



Pmags are excellent magazines all the way around and primary arms delivers with fast shipping and excellent customer service!

40 is better than 30


Reliable and fun!

MAGPUL PMAG 40rd NON-Window GEN M3 - Black


these are the best for the money.

Best high capacity magazine


These things are awesome. Period. Only slightly larger than the regular 30rd PMAG, and a whole lot smaller than other 50-60rd magazine options, while being quite more reliable than those other options.

Works Great


This mag feeds fine and is very comparable to the 30rd version however it is much longer and heavier also it is slightly more loose fiting in my bushmaster lower compared to standard mags

Sick mag had to have one.


Very cool magazine. Fast shipping.

Pmag 40 Round


Very fast shipping , this order shipped same day. Always get a tracking #. Customer Service is always top notch. Their one of the companies who didn't price gouge on Pmags. Thanks

Good mag/great service


What else is there to say, service is the absolute tops from PA and the mag is pretty nice too. The only thing I would ding PA is the 1 mag limit right now, wish it was two mags.