ProMag AR 5 7 Drum Magazine 5 7X28MM 55 Round Drum Fits AR Style FN 5 7 Polymer Black DRM A80 UPC 708279015601
Product Description
The ProMag AR 5.7 55-Round Drum Magazine in Black (MPN: DRM-A80) is a high-capacity feed system engineered specifically for AR-57 upper receivers and carbine conversions chambered in 5.7x28mm. Utilizing the top-loading feeding geometry of the AR-57 platform, this drum magazine expands overall round capacity to 55 continuous rounds of 5.7x28mm ammunition, making it ideal for high-volume range training, competition, and tactical staging.
Constructed in the USA, the DRM-A80 housing is molded from ProMag's proprietary DuPont® Zytel™ high-impact glass-filled polymer. This lightweight material ensures exceptional resistance to physical impact, dropping, and thermal deformation during rapid-fire schedules. Internal components feature a heat-treated chrome silicon wire spring and a smooth-gliding anti-tilt polymer follower to maintain constant spring tension and eliminate feed jams across the entire 55-round payload.
Designed w/ a clear rear polymer cover, the ProMag DRM-A80 allows shooters to instantly inspect remaining round counts at a glance. Featuring smooth feeding ramps and precision-molded indexing lugs, it seats cleanly into top-loading AR-57 receiver cuts, providing reliable feeding performance for 5.7x28mm firearms enthusiasts.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct fit for AR-57 (AR-5.7) top-loading upper receivers and carbines chambered in 5.7x28mm. (Note: Will NOT seat directly into FN P90 / PS90 lower magazine wells without weapon-specific latch clearance checks, nor standard AR-15 5.56/.223 lower receiver magwells).
- Perform a complete firearm safety check: drop the lower magazine/casing collector, retract the charging handle, and visually/physically inspect the chamber to verify zero live rounds are present.
- Load 5.7x28mm cartridges into the top feed lips of the drum, ensuring each round sits fully back against the rear guide spine.
- Align the forward indexing lip of the DRM-A80 drum with the top mounting channel of the AR-57 upper receiver.
- Press the drum firmly downward into the top receiver rail until the dual retention latches click positively into place.
- Cycle the bolt handle to chamber the first round and confirm smooth feed lip geometry before live firing.
- Store drum at partial or zero tension when not staged for defensive use to prolong spring fatigue life.
Key Features
- 55-Round High-Capacity Drum Payload: Maximizes firing schedules w/ 55 continuous rounds of 5.7x28mm ammunition.
- DuPont® Zytel™ Polymer Construction: High-impact glass-reinforced polymer body resists severe shock and temperature extremes.
- Heat-Treated Chrome Silicon Wire Spring: Fatigue-resistant internal spring guarantees uniform follower tension from round 1 to 55.
- Clear Inspection Window: Transparent rear housing section allows rapid visual accounting of remaining round capacity.
- Smooth Anti-Tilt Follower: Self-lubricating polymer follower prevents tilting, binding, and double-feed malfunctions.
- Made in the USA: Manufactured by ProMag Industries w/ a full factory lifetime warranty against defects.
Product Specifications
- Brand: ProMag Industries
- Model/Series: AR 5.7 Drum Magazine
- MPN / SKU: DRM-A80
- UPC: 708279015601
- Platform Compatibility: AR-57 Upper Receivers / 5.7x28mm Carbines
- Caliber Compatibility: 5.7x28mm
- Capacity: 55 Rounds
- Body Material: DuPont® Zytel™ Glass-Filled Polymer
- Spring Material: Heat-Treated Chrome Silicon Steel
- Finish / Color: Matte Black w/ Clear Rear Panel
- Weight: 1.25 lbs (Unloaded)
- Country of Origin: USA
