$22.75
418 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The PMAG 40 GEN M3 is built around the idea that more capacity doesn't have to mean more bulk. You get a full 10 extra rounds compared to the standard 30-round magazine, without sacrificing the handling or balance that makes Magpul magazines so popular in the field. Whether you're running competition stages or need extended capacity for your range sessions, this magazine stays true to the Magpul name for dependable feeding and durability.
Magpul redesigned the GEN M3 with updated polymer materials and manufacturing processes that outperform previous generations. The constant-curve internal geometry works with a stainless steel spring and four-way anti-tilt follower to ensure each round feeds smoothly, whether the magazine is loaded full or running down to the last few cartridges. Feed reliability is handled, but Magpul went further with reinforced feed lips and an over-travel stop on the spine to prevent over-insertion on compatible platforms.
The exterior gets an aggressive grip texture on the front and rear that gives you solid control even when things get wet or slippery. A flared floorplate helps with magazine extraction and handling while staying slim enough to work in double and triple tactical pouches. The paint-pen dot matrix on the body lets you mark magazines for quick identification, and simple tool-less disassembly makes cleaning straightforward. For added versatility, the GEN M3 geometry works across more platforms than just AR-15s, including HK 416, SCAR MK 16/16S, M27 IAR, and other NATO-spec systems.
Made in the USA, this magazine is constructed to exceed military performance specifications. Real-world feedback from competition shooters, duty users, and range enthusiasts consistently shows zero malfunctions with these mags, even under heavy use and fast magazine changes. The GEN M3 polymer resists crushing, impacts, and environmental abuse while remaining lightweight. The only thing separating the 40-round spring from the 30-round version is capacity, so keep them organized—mixing springs between capacities affects feeding.
The PMAG 40 gives you 10 extra rounds in nearly the same profile, so it doesn't feel drastically different to carry or reload. Both share the same materials, anti-tilt follower, and feed geometry. The main difference is spring length—they use different springs and aren't interchangeable. The 40-round magazine is slightly longer, but still slim enough for most magazine pouches.
Yes. The GEN M3 design uses modified internal and external geometry that works with Colt-spec AR-15 and M4 platforms, but also functions with HK 416, FN SCAR MK16/16S, M27 IAR, British SA-80, and other NATO-spec systems. Some users with older POF rifles report needing to slightly file the over-travel stop, but that's a minor adjustment.
Customer feedback and field testing show zero malfunctions with the PMAG 40 GEN M3. Law enforcement departments use them constantly loaded for patrol, competition shooters run high-round-count stages with them, and range users report flawless feeding. The constant-curve geometry and anti-tilt follower ensure smooth feeding from full to empty.
No. The spring is longer on the 40-round magazine, and mixing springs between capacities causes feeding problems. Magpul marks the 40-round baseplate with '40 ROUNDS' to prevent confusion. The baseplates are physically compatible, but using the wrong spring defeats the magazine's reliability.
| UPC | 873750009698 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG233-BLK |
| Action | |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 40-Round |
| Color | Black |
| Model | |
| Model Fit | AR-15 |
| Product Type | Magazine |
| Quantity | 1 |
| Shipping Weight | 0.4 |
You must be logged in to post a review.
Reviews
There are no reviews yet.