One problem the AFP is facing right now, is the issue of SOME (not all, but SOME) AFP personnel selling issued firearms for profit. There has to be a way to contain the problem as much as possible, & one possible solution revolves around the traceability of firearms using Serial Number.
All firearms produced by the manufacturer are stamped w/ its own, individual Serial Number (S/N). This is one way the manufacturer keeps track of its firearms. These records could be used innovatively to keep minimize military firearms trafficking.
A firearm's S/N could, of course, be tampered with, & the skill of some gunsmiths are such that they can reportedly change a S/N without leaving a visible trace that it has, indeed, been tampered with.