10/20 Magpul PMAG 30 AR 300 B GEN M3 300 Blackout
Caliber: 300 Blackout
Capacity: 10 rounds (in a permanently modified 20 round magazine body)
Color: Black
Optional upgrade: Install Black Ranger Plate (must be added at time of modification)
Modification Details:
-
Permanently limited to 10 rounds with our proprietary internal limiter.
-
Limiters are chemical and heat resistant — designed never to break or fail.
-
Base sealed with industrial-grade polymer adhesive — no rivets or pins.
-
Magazine cannot be disassembled without damage.
-
Full-length spring remains unrestricted.
About the PMAG 20 AR 300 B GEN M3:
-
Purpose-built for 300 Blackout for improved feeding and reliability.
-
Unique rib design prevents cross-loading with 5.56 magazines.
-
Features next-gen impact- and crush-resistant polymer construction.
-
Aggressive texture for secure handling.
-
Paint pen dot matrix for easy identification.
⚠️ Note: Impact/dust cover is not included — sold separately.
Robert (verified owner) –
Thank you for taking the time to enhance these 300 blackout Magpul 20 round magazines for the people of California and converting them to 10/20! they work flawlessly so far and are a far more reliable feed into the chamber than a standard 556 gen 3 p-mag. Thanks again! We need more companies like yours that help the people in high restriction states instead of the company’s that don’t care.
Martin W. jr (verified owner) –
This magazine works perfect with the radical 300 blackout. The stock magazine was not cycling the rounds!! I took my 300 blackout to the range and boom!!!! That magic happened not jam at all!!
Kyle (verified owner) –
Fast and Very Clean
Theng (verified owner) –
PERFECT! It’s what I’ve been looking for. Looks nice, feels nice and durable, fits perfect, and it’s CA LEGAL!
David (verified owner) –
I love these mags. Ive been trying to find mags for my 300 blackout that were Washington compliant but had a bit more size for easier manipulation of the magazine. This 20 round case is the perfect size for my 10.5 AR pistol. This is my second purchase of these mags and I will definitely buy more in the future.
Hermie A (verified owner) –
I needed more mags being that I am in CA. CALEGALMAGS had what I needed in-stock and at a great price. You can never go wrong with a MAGPUL. Always looks great, durable, and Fitment is perfect with smooth operation! I highly recommend this!
Scott C (verified owner) –
Mags are solid .Very high quality.Accepting both individual and quick load very well.Very satisfied.Seamless ordering and delivery.
James H (verified owner) –
Love the mags. Especially for a communist state.
Neil Post (verified owner) –
Magpul quality, commie compliant. I will be a repeat buyer unless I can escape to a free state.
Bernard Marzolf (verified owner) –
This magazine feels great standard magpul 20 limited to 10 is great for people like me living in restrictive states! Great feel and gives the shooter greater control when holding the rifle by the magazine well, while still having a lower profile big upgrade from 10 rounders, works great with the MEANARMS speed loader! 10/10