Magpul PMAG 40 AR/M4 5.56x45mm Magazine Gen M3

The Magpul PMAG 40 AR/M4 Gen M3 delivers extended capacity and battlefield-proven reliability in a design built to push the limits of modern polymer magazine performance. Engineered for AR15 and M4 platforms chambered in 5.56x45 NATO or .223 Remington, this next‑generation magazine offers a full 40‑round capacity while maintaining the rugged construction and refined handling shooters expect from the Gen M3 line. With enhanced materials, reinforced geometry, and features tested against demanding military standards, it’s built to keep running when conditions turn harsh and every round counts.

Although optimized for Colt‑spec AR15/M4 rifles, the PMAG 40 Gen M3’s revised internal and external geometry gives it broad compatibility beyond the traditional platform. It functions reliably in rifles such as the HK 416, MR556A1, M27 IAR, British SA‑80, FN SCAR 16/16S, and others. Whether used for training, duty, or hard field use, this magazine offers dependable feeding and consistent performance across a wide range of weapon systems.

Inside, a long‑life stainless steel spring drives a four‑way anti‑tilt follower through constant‑curve internal geometry, ensuring smooth, reliable feeding from the first round to the last. The magazine breaks down easily without tools, allowing fast cleaning and maintenance in the field. Magpul also refined critical areas of the Gen M3 design, including a strengthened bolt catch notch for improved clearance and an over‑travel stop that prevents over‑insertion in compatible firearms.

Handling is equally refined. Low‑profile ribs and aggressive front and rear textures help maintain control under stress, with or without gloves. The flared floorplate improves handling during reloads, offers better drop protection, and still fits cleanly in tight double or triple mag pouches. Magpul’s paint pen dot matrix on the base enables quick identification and load tracking, keeping magazines organized and mission‑ready.

Made in the USA, the PMAG 40 Gen M3 is a trusted, field‑tested upgrade for shooters who need the durability of Magpul’s polymer construction paired with expanded capacity and maximum reliability. From extended training sessions to high‑tempo environments, it’s built to deliver confidence every time you hit the range or step into the field.

Order it today from SMKW!