ProMag DPMA4 StandardBlack DuPont Zytel Polymer Detachable 40rd 308 Win for AR-10

The ProMag DPMA4 40-round .308 Win detachable magazine for AR-10 rifles is built for shooters who want to spend more time at the range and less time fumbling with reloads. Standard AR .308 magazines max out at 10 or 20 rounds, which gets old fast when you're running drills or putting rounds downrange. This polymer magazine delivers that expanded capacity without the bulk, fitting DPMS and SR-25 pattern rifles reliably and securely.

Construction matters with magazines. The DPMA4 is molded from DuPont Zytel polymer—a material engineered for durability and consistent performance through thousands of cycles. The feeding system relies on a heat-treated chrome-silicon wire spring that maintains constant pressure, ensuring smooth, reliable rounds whether you're loading one or filling it to capacity. It's the kind of engineering that keeps your rifle running when it counts.

Made in the USA and finished in black, this magazine is a straightforward, no-nonsense choice for AR-10 shooters who want factory-standard compatibility without the premium price of proprietary designs. Whether you're building a 308 rifle platform for long-range precision, competition shooting, or general duty, the 40-round capacity gives you the flexibility to shoot the way you want to shoot.

Key Features

• 40-round capacity for .308 Win cartridge
• DuPont Zytel polymer body for durability and longevity
• Heat-treated chrome-silicon wire spring for reliable feeding pressure
• Fits DPMS and SR-25 pattern AR-10 rifles
• All-black finish
• Made in the USA

Specifications

Frequently Asked Questions

Will this magazine work with my AR-10?

The ProMag DPMA4 is designed for DPMS and SR-25 pattern AR-10 rifles. Verify your rifle's magazine well pattern before purchasing to ensure compatibility.

What's the advantage of a 40-round magazine over a 20-round?

The 40-round capacity means fewer magazine changes during range sessions or training, letting you focus on shooting rather than reloading magazines. It's especially useful if you're running drills or high-volume practice.

Is the Zytel polymer reliable for long-term use?

DuPont Zytel polymer is engineered for durability and has a proven track record of withstanding repeated use cycles. Combined with the heat-treated spring, the magazine is built to maintain reliability over time.

Is this magazine made in the USA?

Yes, the ProMag DPMA4 is manufactured in the USA.