6 vacuum sealed 20rd boxes of 62gr 5.56 NATO (M855) LAP ammo from PMC Ammunition. Manufactured to the exacting specifications required by such organizations and demanded by our customers, X-TAC™ is the choice for the professional and enthusiast alike. At PMC, we know your job demands that you think of everything. But we also know that when the chips are down you shouldn’t be thinking about your ammunition. Battle Packs contain 6 boxes, vacuum sealed together. Comes with stripper clips Technical Specifications MPN 5.56K Bullet Type: LAP Weight: 62 grain Velocity (feet per second)   Muzzle: 3100 100 Yds: 2762 200 Yds: 2449 300 Yds: 2157 400 Yds: 1885 500 Yds: 1637 Energy (foot-pounds)   Muzzle: 1323 Bullet Path (inches)   Muzzle: -1.50 100 Yds: 0 200 Yds: -3.1 300 Yds: --11.9 400 Yds: -28.3 500 Yds: -54.6 Ballistic Coefficient 0.304 Bullet Length 0.923 Sectional Density 0.177