Magpul PMAG M3 Window 7.62 20rd magazine for AR10-style rifles. Witness window, reliable feeding, and durable polymer construction for range training, competition, and 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 7.62 AR10 magazine delivers premium reliability for modern sporting rifles. This 20-round magazine holds .308 Winchester or 7.62 NATO ammunition with proven performance. Furthermore, the translucent witness window lets you verify round count without removing the magazine.
The M3 generation features Magpul’s latest engineering advances in magazine design. Additionally, the anti-tilt follower ensures reliable feeding in any condition. The reinforced polymer body resists deformation during extended use. Moreover, aggressive texturing improves grip and handling when you need it most.
Compatibility and Performance
This PMAG M3 fits DPMS, SR25, and LaRue OBR pattern rifles. Furthermore, it works with most AR10-style platforms using standard .308 magazine wells. The magazine’s proven design delivers consistent performance across compatible platforms. Therefore, verify your rifle’s magazine well before purchasing.
Magpul’s reputation stems from rigorous testing and quality control. Additionally, the PMAG line is trusted by military and law enforcement professionals worldwide. The M3 represents the gold standard in modern magazine engineering. Indeed, shooters depend on this magazine for precision and reliability.
Ideal for Shooters and Hunters
Competition shooters rely on the PMAG M3 for reliable backup capacity during matches. Furthermore, hunters using .308 rifles benefit from the magazine’s consistent performance in the field. Additionally, range training demands dependable feeding, and the M3 delivers. Therefore, precision shooters and tactical operators trust Magpul’s proven design.
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: What AR10-style rifles does the Magpul PMAG M3 fit?
A: This magazine is designed for DPMS, SR25, and LaRue OBR pattern rifles. Additionally, it works with most AR10-style platforms using standard .308 magazine wells. However, always verify compatibility with your specific rifle before purchase to ensure proper fit.
Q: Does the witness window on the PMAG M3 work reliably?
A: Yes, the translucent witness window provides accurate round visibility in any lighting condition. Furthermore, Magpul’s engineering ensures the window maintains clarity through extended use. The design prevents accidental damage to the window during normal handling and transport.
Q: What is the warranty on the Magpul PMAG M3 magazine?
A: Magpul stands behind the PMAG M3 with a comprehensive warranty covering manufacturing defects. Furthermore, the M3 is built to last through years of regular use and abuse. Contact Magpul directly or reach out to us at Western Sport for specific warranty details.
Q: Is this magazine legal to own and use in Texas?
A: Yes, the Magpul PMAG M3 is fully legal in Texas with no magazine capacity restrictions. However, it cannot ship to certain states including California, Colorado, Connecticut, and others.
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