10/30 Magpul PMAG 30 AR 300 B GEN M3 — 300 Blackout
Caliber: 300 Blackout
Capacity: 10 rounds (in a permanently modified 30-round magazine body)
Color: Black
Modification Details:
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Permanently limited to 10 rounds with our proprietary internal limiter.
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Limiters are chemical and heat resistant — designed never to break or fail.
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Base sealed with industrial-grade polymer adhesive — no rivets or pins.
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Magazine cannot be disassembled without damage.
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Full-length spring remains unrestricted.
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Note: Pmag Ranger Plates cannot be added after modification — request installation if desired.
About the PMAG 20 AR 300 B GEN M3:
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Purpose-built for 300 Blackout for improved feeding and reliability.
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Unique rib design prevents cross-loading with 5.56 magazines.
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Features next-gen impact- and crush-resistant polymer construction.
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Aggressive texture for secure handling.
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Paint pen dot matrix for easy identification.
⚠️ Note: Impact/dust cover is not included — sold separately.
David O (verified owner) –
Great mags. Work great with my 300 blk rifle. Love it!!!
Richard A (verified owner) –
I have not tried the mags yet but Calegalmags shipped the mags the same day as ordered and I received them 3 days earlier than expected. Great shipping and I will write a follow up review as soon as I use the mags.
Lance B (verified owner) –
Great product. Great service and fast shipping. Was hoping this would solve some feeding/extraction issues, but feel it’s something other then the mags. But still supper stoked to have CA compatible 10/30 300Blk mags specific.
Steve (verified owner) –
Great product, great company to buy from. I live (at least for now) in one of the stupid states with magazine capacity restrictions and it’s really hard to find this stuff locally. Cal Legal Mags is always there for me. Thanks guys!! I’ve purchased at least 10 over time and they are always delivered quickly and operate flawlessly.. These particular mags are a must if you fire lots of different bullet profiles out of the 300BLk. Some 30 cal bullet profiles don’t like the notch the goes all the way up a standard .223 mag.
Bruda (verified owner) –
Great available products from CALEGALMAG.COM . The options of available products is superb. The website and PURCHASING process was easy, shipping was fast and a descent $ CALEGALMAGS ARE TRUE LIFE SAVERS THANK YOU¡! ??
Jay (verified owner) –
I am very pleased with performance of the magpul blocked mags. I have also bought 308 mags and love them also, I will be ordering more soon.
Steven (verified owner) –
The 10/30 Magpul .300 blackout magazines are solid and great performers. Fit is perfect and feed great.
Tim –
Work great and look great, would buy again!