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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Best Ever


I am new to the AR platform. I shot the 40rd with no flaws, can't wait to order more.

Excellent as always


I have ordered stuff from this company for 4 years and have never had even the slightest problem. Good people. Excellent shipping.

What you expect from Magpul, awesome


I jumped on this when I got the email they were in stock. Not that much longer than a 30 rd. I don't know I would switch to all these but it's great for 3 gun and as a main mag that lives in the case w/ rifle. I am becoming a Magpul fan. Good stuff.

Best prices....Best products....Best cust. service


I love all pmags. These were sold out so I emailed customer service to see if they would honor the price. I specifically delt with Laura Farrington who was awesome at helping me out!!!! She made sure that I would personally receive the sale price ones the items returned. Thanks again!!!

I love you magpul


I love you magpul

Great Product & Reliable Shipping


I ordered a PMAG 40rd as soon as I received the notification e-mail indicating that they were in stock. My order arrived just a few days after the placement date and was in perfect condition. I appreciate the reliable & quick service PrimaryArms provides and will recommend anyone to the website. Time to hunt!

40rd pmags


It is impossible to have too many of these. Even if you had a giant vault full of them and you swam through them like Scrooge McDuck every morning... you could still use a few more.EFM

what can I say.....


It's a Magpul Pmag. Works great! Only complaint is the limit of 1!?!? How about at least 2 or 3 next time?

It's a pmag


It's a pmag....utterly boring in the reliability. Love shooting prone with the magazine as support. .

magpul 40 round mag


loaded easily, fit in new ar pistol perfectly