Magpul PMAG 30 Gen M3 300 Blackout AR-15 Magazine - 30 Round

Manufactured by Magpul Industries
Manufactured by Magpul Industries
28 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.



The PMAG 30 AR 300 B GEN M3 is a dedicated magazine for rifles chambered in 300 Blackout. While standard AR-15 magazines may be used for this cartridge, the potential danger exists to chamber and fire a 300 Blackout round in a 5.56 NATO chamber with catastrophic results.

Optimized for 300 AAC Blackout, the PMAG 30 AR 300 B retains all the GEN M3 features adding a distinct rib design and smoother upper texture to set them apart from other PMAGs for quick visual and tactile identification. This AR mag is easy to disassemble and clean for regular maintenance and won't fail you in the field.

  • Dedicated 300 Blackout magazine
  • Impact and crush resistant polymer construction
  • Optimized internal geometry for 300 BLK
  • Anti-tilt, self-lubricating follower
  • Long life USGI-SPEC stainless steel spring
  • Over-travel insertion stop
  • Distinct rib design and smoother upper texture for easy identification
  • 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 Gauge300 Blackout
Magazine Capacity30
PlatformAR-15 Magazines

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

28 reviews

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Works better for Russian ammo

by -

Bought these cause fatter Russian bullets were getting jammed in the 556 mags. They work

PA and Magpul...'nuff said


the best 300 mags on the market they arrived on time and they work perfectly Thanks PA ...gonna get some more too

The only 300 blackout magazines I use

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Pmags are just the best. Then the different texture does make it simple to distinguish this as a 300 black magazine. More importantly the internals are optimized for the 300 blackout. They feed any and all ammo.

Right On The Money

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I found these MAGPUL PMAG 30 300 Blackout GEN M3 Magazines were in-stock at Primary Arms when they were out-of-stock everywhere else. They were very reasonably priced and the shipping was really fast! Thanks again to Primary Arms!

300BLK Specific Mags

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This 300BLK Magpul 30rd magazine is a great addition to my 300 Blackout build, and are very reliable.
<br>Aside from the label 300BLK and the distinct rib design, I replaced the lockplate with Type 1 Tactile Lock Plate for a distinguishing marker. It makes this mag easily identifiable from my other 556 mags, even in the dark.
<br>I am waiting for the release of 20rd 300BLK magazine which Magpul says it's coming soon.
<br>PA, please don't forget to notify me once they're available!

Great Price

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Perfect like always awesome and great service especially in these times, be safe 👍

There MAGPUL what elses needs to be said

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I say a Magpul video talking about theses new magazines they had out and how they designed them for the 300 blackout and how they are better than .223/5.56 magazines. So I bought 4 of them. Well worth it I did see and little difference in the feeding and performance of the weapon during shooting and cycling.

Best 300BK Mag Ever!

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Top quality and function: Specifically made for the 300 Blackout!

Outstanding Service/Delivery

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I will be buying the majority of my items from you. The way you guys/ladies go out of your way to keep Customers informed of their orders is Amazing. I can tell you that I dropped 2 Other companies due to their lack of communication as well as Still waiting on My Product and I actually ordered my items from you after I ordered from them. Thank you for the Outstanding Job and of Course being from Texas!!!!👍👍👍👍👍

Perfect as expected.

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No issues, as expected from Magpul.