User blog comment:Legionwrex/Geth vs Covenant/@comment-75.59.212.21-20120730035919/@comment-75.59.212.21-20120730041140

Also Mass Accelerators are compressed of multiple Hard and heavy metals that are fired off which is far more damageing than any bullet and as kinetic shields are able to deflect Mass Acclerators for sometime a normal bullet wouldn't work well enough other than scratch the shield Just a Sidnote