ProMag Sig Sauer P320 9mm 50 Round Drum Magazine Flat Dark Earth DRM A55 FDE UPC 708279016059
Product Description
The ProMag DRM-A55-FDE (SKU: DRM-A55-FDE / UPC: 708279016059) delivers extended operational capacity and unrelenting firepower for the modular Sig Sauer P320 9mm platform. Engineered to store and feed 50 rounds of 9x19mm Parabellum ammunition, this drum magazine eliminates frequent magazine reloads during intense tactical training, dynamic range drills, PCC competition stages, and home defense staging. Designed to seat directly into any standard 9mm P320 grip module, it provides a stable, balanced center of gravity that minimizes muzzle rise during rapid semi-automatic firing strings.
Built for structural endurance under extreme operating conditions, the drum body is molded from a proprietary DuPont® Zytel™ glass-filled nylon polymer that resists harsh chemical solvents, heavy UV exposure, drop impacts, and thermal warping. The critical feed section features a full-length, heat-treated carbon steel tower finished in corrosion-resistant bluing to preserve factory feed lip geometry, prevent spread under spring tension, and guarantee seamless slide clearance. Internally, a heat-treated stainless steel wire spring provides continuous, uniform upward force against an anti-tilt injection-molded follower, preventing nose-dive malfunctions across both brass and nickel-plated 9mm casings.
Ergonomically contoured in Flat Dark Earth to visually complement military-issue M17, M18, and tactical coyote grip modules, the DRM-A55-FDE incorporates an integrated rear ratcheting wheel to assist in compressing the heavy-duty spring stack during loading. The steel upper tower locks securely into factory P320 magazine catches without excessive play or binding, ensuring positive lock-back on the last round when running standard velocity duty ammunition. Proudly manufactured in the United States, this 50-round drum is an indispensable asset for carbine-conversion chassis users running the Flux Raider or B&T USW-320 systems.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Fits 9mm Sig Sauer P320 (Full-Size, Carry, Compact, X-Series, M17, M18, AXG) and P320-pattern chassis systems. CRITICAL: Exclusively for 9x19mm chamberings; does NOT seat or function in .45 ACP or 10mm P320 frames, and will NOT fit P365 micro-compacts. Never apply liquid petroleum lubricants, grease, or solvent sprays inside the polymer drum body, as they attract unburnt propellant fouling and impede follower travel; if cleaning is required, disassemble dry and wipe clean with a microfiber cloth or apply a dry PTFE dry-film lubricant sparingly.
- Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty. Lock the slide to the rear before commencing magazine insertion.
- Load ammunition progressively into the feed tower; relieve internal spring tension sequentially by utilizing the rear finger-assist rotor dial as rounds are inserted into the feed track.
- Inspect the top cartridge to verify proper horizontal seating against the heat-treated blued steel feed lips before inserting into the host magwell.
- With the slide locked to the rear, insert the steel magazine tower firmly into the P320 grip module until the magazine release catch audibly clicks and locks positively into the engagement window.
- Release the slide forward via slide catch or aggressive overhand rack to chamber round number one, perform a manual press check, and confirm proper extractor hook engagement prior to live-fire drills.
Key Features
- Extended 50-Round Drum Capacity: Maximizes sustained firing capability for range drills, defensive applications, and PCC platforms without changing magazines.
- DuPont® Zytel™ Polymer Housing: Ultra-rugged glass-filled nylon body provides exceptional impact resistance, thermal stability, and corrosion immunity.
- Heat-Treated Blued Steel Tower: Stamped carbon steel feed tower maintains strict dimensional tolerances and protects feed lip integrity under heavy use.
- Heat-Treated Stainless Steel Spring: Provides consistent, fatigue-resistant upward tension to feed every round reliably down to the final empty casing.
- Injection-Molded Anti-Tilt Follower: Guarantees smooth cartridge transition from the radial drum track into the single-feed upper neck.
- Ergonomic Loading Assist Mechanism: Relieves spring resistance manually during loading to streamline high-volume round replenishment.
- Flat Dark Earth (FDE) Finish: Matches M17, M18, and tactical coyote P320 grip modules and carbine conversions.
- Made in the USA: Built in the United States by ProMag Industries under rigorous quality control standards.
Product Specifications
- Brand: ProMag Industries®
- Model/Series: Sig Sauer® P320™ 50-Round Drum Magazine
- MPN / SKU: DRM-A55-FDE / DRMA55FDE
- UPC: 708279016059
- Caliber: 9mm Luger (9x19mm Parabellum)
- Capacity: 50 Rounds
- Body Material: DuPont® Zytel™ Glass-Filled Polymer
- Tower Material: Heat-Treated Carbon Steel (Blued Finish)
- Follower: Injection-Molded Polymer
- Spring: Heat-Treated Stainless Steel Wire
- Color: Flat Dark Earth (FDE)
- Platform Compatibility: Sig Sauer P320 9mm (Full-Size, Carry, Compact, M17, M18, XSeries, Flux Raider)
- Country of Origin: United States
