This is the classic M2 PMAG in 30 round 5.56x45mm and .223 calibre for AR/M4 rifles.
The M2 model set the standard for AR magazines with it's rugged polymer construction, extremely reliable self lubricating anti-tilt follower, innovative round count window and non slip textured grip surface
Compatible with all AR-15s.
Not compatible with SA80 / L85 and HK416, please see the PMAG M3 version.