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

Manufactured by Magpul Industries
Manufactured by Magpul Industries
53 Reviews

In Stock

NOTE: Limit 10 per household. Quantities exceeding 10 will not allow checkout.

Standard orders will ship out same day if ordered by 3:30pm CST. 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

53 reviews

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As expected

by -

No problem at all, I plan on purchasing more very soon.

Great quality

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I don't see how it could be any better..


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Like anything that says Magpul it’s good stuff

Magpul is Magpul...

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Great magazine, very well made and I even used with my .300 blackout rifle and had no issues. I’m currently using it with my MK18 and haven’t any malfunctions. Great mag overall. Thanks to Primary Arms for being one of the most modest gun websites (even throughout these time when people abuse prices) and haven’t been price gouging none of their products, even through these difficult times. Thanks Primary Arms.

Magpul magazine

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Magpul has best magazine on market, works flawlessly

40rd PMAGs, what's not to love?

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40rd capacity + Magpul reliability + low cost = unbeatable

Pmag 40

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Perfect equipment and excellently priced

Fast shipping

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Just what I ordered, in great new condition and well packed. Will order more soon. Thanks again

Excellent Mag

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Magpul....excekkent and reliable mag

Magpul...nothing better

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Sturdy and reliable feed