ProMag Magazine Sig Sauer P320 9mm Luger 50-Round Drum Polymer Black

The ProMag 50-round drum magazine for Sig Sauer P320 9mm brings high-capacity capability to your duty, training, or competition setup. Drum magazines let you pack serious firepower without constant reloads—ideal for range sessions, tactical training, or anyone who values magazine flexibility on the pistol platform. This polymer-bodied design balances weight savings with rugged construction, built using injection-molded mil-spec polymer compounds paired with strategically placed steel reinforcement where it counts.

ProMag combines old-school reliability with modern manufacturing: the drum housing uses a proprietary DuPont Zytel-based polymer, while the upper tower features a full-length internal steel insert stamped and welded using the same process as factory magazines. The follower is injection molded for consistent feeding, and the magazine spring is heat-treated stainless steel—the kind of material choice that matters when you're trusting a magazine with live fire. Everything is made in the USA.

Drum magazines demand user familiarity; they handle differently than standard single-stack mags, and they benefit from regular inspection and maintenance. This one's engineered for Sig Sauer P320 9mm platforms specifically, so verify compatibility with your exact configuration before relying on it for duty or defensive use. The lifetime manufacturer's defect guarantee backs the craftsmanship, though like any high-capacity magazine, proper care and occasional cleaning keep it running smoothly.

Key Features

• 50-round capacity for extended range time and training sessions
• Proprietary DuPont Zytel-based polymer drum housing for durability and weight efficiency
• Full-length steel internal insert in upper tower, stamped and welded for strength
• Heat-treated stainless steel spring for reliable feeding
• Injection-molded follower for consistent performance
• Made in USA
• Lifetime guarantee against manufacturer defects

Specifications

Frequently Asked Questions

Will this 50-round drum fit my Sig Sauer P320?

Yes, this magazine is specifically designed for the Sig Sauer P320 in 9mm. Always verify your exact P320 variant and test load a few rounds before relying on it.

What's included with the magazine?

You receive the 50-round drum magazine itself. Like most magazine purchases, it arrives empty and unloaded.

How does the drum compare to standard P320 magazines?

Drum magazines hold significantly more ammunition—in this case, 50 rounds versus the typical 10–17 rounds in factory P320 mags—but they're bulkier, heavier, and require different handling and loading technique. They excel for range training and competition but are less convenient for everyday carry or duty use.

Is there a warranty on this magazine?

ProMag backs this magazine with a lifetime guarantee against manufacturer defects. Normal wear, maintenance, and user damage are not covered.