[FMA] [Jon ?] Close combat weapons - two systems ?

In rereading the FMA material, there seems to be two distinct systems
for
close combat weapons.

In the first, close combat is a single-opposed die roll with the
attacker
and defender each rolling their quality die and possibly doubling or
quadrupling it.

In the second (implied from costing), close combat weapons have an
attack
die value and an impact die value.

I'm interested in the more detailed second system, but there's a lot of
detail missing.  Does anyone have this ?