Magpul Industries PMAG Impact/Dust Cover, Fits 5.56x45 PMAG 30 AR/M4 GEN M2 MOE, PMAG 20, And EMAG, 3 Pack, Polymer Construction, Black MAG216-BLK Supplemental Impact/Dust Covers for the 5.56x45 PMAG 30 AR/M4 GEN M2 MOE" PMAG 20" and EMAG" designed to minimize debris intrusion and protect against potential cartridge damage during storage and transit. NOTE: These will also fit all older pre-GEN M2 variants of AR15/M16 PMAG (with Black or Foliage Followers). This cover will likewise fit the PMAG GEN M3 but" being it is of a slightly different design" will not adequately seal that magazine against debris intrusion.