Standardized guns and ammo

Recntly someone mentioned (I forgot to keep the message around, and
don't recall who it was) that rounds would not be interchangable
between tech levels.  I always assumed that there was some sort of
standard "Imperial 7mm" or "Imperial Marine 9mm long" like we have
today with such things as 7.62 NATO or .45 ACP.  Sure, you can
occasionally find non-standard stuff, but it seems to me that it'd be
much cheaper to produce rounds locally (maybe 1 world in the subsector
gets the contract and ships them to the bases).

As far as guns go, they are probably produced under contract from a
standard design so that troops do not need to be retrained when they
are stationed in different subsectors.

Of course, this all assumes that the Imperial Bureaucracy is smart
enough to go for the lowest co solution.    Or greedy enough to
realize the high bribe potential involved in awarding the Imperial Contracts.

Just a few incoherent thoughts.

Joe