The ProMag FN 5.7x28mm AR 55-Round Drum Magazine provides extended capacity for AR-15 platform rifles chambered in 5.7x28mm.
- Caliber: 5.7x28mm
- Capacity: 55 rounds
- Compatible Firearms: AR-15 platform rifles chambered in 5.7x28mm
- Material: Polymer body with steel feed lips
- Follower Type: Self-winding spring mechanism
- Features: Rear window for round count, no manual winding required
- Restrictions: Not legal in California, New York, Connecticut, Massachusetts, New Jersey, Colorado (certain counties), Maryland, Hawaii, Vermont, Washington D.C., and other jurisdictions with capacity limits
- Warranty: Lifetime warranty from ProMag
