Whoever invented the adage, โless is moreโ never encountered theย Magpul PMAG 40ย STANAG. While it might not seem like a major achievement to younger shooters, there was a time not long ago that anything over 30 was considered too unreliable for competitive or serious use.
So how did Magpul succeed where others failed? Letโs take a closer look inside the PMAG 40 to find out.
By James Grant, The Mag Life Blog
PMAG 40 Now With 33% More Freedom!
All of the same aspects of the standard 30-round PMAG that make them so durable and reliable, are present on the PMAG 40. These magazines feature the same anti-tilt follower that prevents rounds from taking a nosedive under the chamber. This follower also ensures steady, regular feedingโregardless of how many rounds remain in the mag.
The PMAG 40 is also built from the nearly indestructible polymer as all PMAGs are, and features the same molded pattern for added durability and style points. Also present is the clip-on dust cover and polymer baseplate. The only difference here, is that the baseplate retention piece reads, โ40 ROUNDSโ.
That isnโt to say itโs not interchangeable with a 30-round version, it is. But the spring length on the PMAG 40 is much longer than the standard capacity model. Swapping springs between the two results in two unreliable PMAGS. Not to worry, itโs difficult to mix them up. With the longer spring, theย 30-round PMAGย is very difficult to assemble, much less reload. And if the 40 uses the shorter spring, the rounds will feel sluggish in their feeding.
But enough hypothetical failures, how does the PMAG 40 actually run?
Form, Function or Both?
In testing, I ran the Magpul PMAG 40 in three different guns. Each of them representing opposite sides of the AR spectrum.
The first was a standard M4-pattern LaRue Tactical in 5.56mm with a 14.5in barrel and permanently-attached SilencerCo ASR flash hider. The second was an SBRโd franken-AR with a PSA lower, and 8 in barrel chambered in .300blk. The last test gun is a select-fire M16A1 with a 20-inch barrel chambered in 5.56mm.
The LaRue Tactical setup ran 100% with both 55gr FMJ from Winchester and 62gr green-tip M855. The .300blk SBR also ran flawlessly with all ammunition tested. This included 110gr supersonic FMJ, 220gr subsonic FMJ and even the new Winchester 210gr solid copper hunting rounds which feature truncated hollow-points. These same rounds often cause feeding issues inย aluminum USGIย and even some polymer mags.
Lastly, I ran a full PMAG 40 through the M16A1. While the ammunition didnโt last longer than a few breaths, every single round fed and chambered flawlessly. All that remained was a smoking-hot barrel, and a thoroughly perforated paper target.
So why not replace all your PMAGS with the PMAG 40?
Size Matters
Size. The PMAG 40 is substantially longer than the original PMAGS. While this isnโt an issue for competitive shooters, it does have some drawbacks for other folks. The biggest issue, is how the extra length of the magazine prevents the shooter from firing from a prone position. The only other downside is that with the added capacity of the PMAG 40 comes additional weight โ but this is obviously to be expected.
Overall, the Magpul 40-round PMAG continues the companyโs tradition of delivering some of the most reliable, durable magazines available. If you need a few extra rounds, count on the PMAG 40 to deliver them every time.
Read this article in its entirety at The Mag Life Blog.