Magpul PMAG M3 300BLK holds 30 rounds of .300 Blackout ammunition with proven M3 platform reliability. Perfect for range training, competition, and tactical backup capacity.
Update, October 9, 2026: ATF no longer requires a Form 4, tax stamp, fingerprints or registration for suppressors, short-barreled rifles, short-barreled shotguns or AOWs. They now transfer on a standard Form 4473 with a background check. Anything below that mentions a Form 4, a wait or a tax stamp was written before this change. What changed
The Magpul PMAG M3 300 Blackout magazine delivers dependable performance for AR rifles chambered in .300 BLK. This precision-engineered magazine holds 30 rounds with exceptional reliability in demanding conditions. Magpul’s proven M3 platform design ensures consistent feeding and extraction every time you shoot.
Additionally, the robust polymer construction withstands impact and rough handling. The reinforced feed lips prevent deformation under stress. Moreover, the anti-tilt follower ensures smooth, reliable round feeding. As a result, malfunctions become virtually nonexistent.
Proven Magpul Design & Durability
This PMAG features witness holes so you can check your round count easily. Furthermore, the Coyote Tan finish provides tactical aesthetics while resisting wear and corrosion. The magazine is lightweight, adding minimal weight to your rifle setup. Indeed, these features make the PMAG M3 ideal for hunters and tactical shooters alike.
Whether you’re at the range, in competition, or need reliable backup capacity, this magazine performs. The M3 platform has earned trust from serious shooters nationwide. Additionally, it fits standard AR magazine wells without any modification required.
Perfect Fit for .300 Blackout AR Rifles
This magazine works exclusively with AR rifles chambered in .300 Blackout. For example, it pairs perfectly with .300 BLK uppers on existing AR platforms. Therefore, upgrading your ammunition setup simply requires changing to the correct magazine. Always match your magazine to your rifle’s caliber for safe, reliable performance.
The PMAG M3 300 Blackout is built for shooters who demand precision and durability. Furthermore, Magpul backs every magazine with a lifetime warranty against manufacturing defects. Next, learn why Western Sport is your best local source.
Ordering from Western Sport
Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: Will this PMAG M3 work in standard .223/5.56 AR rifles?
A: No, this magazine is specifically designed for .300 Blackout ammunition only. Using it in .223/5.56 rifles will cause feeding and extraction failures. Always match your magazine to your rifle’s caliber.
Q: What warranty does Magpul offer on the PMAG M3?
A: Magpul backs this magazine with a lifetime warranty against manufacturing defects. Normal wear from use is not covered under the warranty.
Q: Is the PMAG M3 better for hunting or tactical shooting?
A: This PMAG excels in both hunting and tactical applications. Hunters appreciate its reliability during critical moments in the field, while tactical shooters value its durability and consistent performance under stress.
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