I noticed "Guns Replacement" option, when available, allows to add some light & medium artillery replacements to the Replacement Pool.
I'm playing the Peninsular War scenery and I noticed that light artillery replacements are quite useless, beeing French Forces mostly equipped with medium artillery.
As a consequence I have plenty of "useless" light artillery replacements in the Replacement Pool, while I'm experiencing a constant shortage of mediun guns.
Perhaps "Guns Replacement" option should be reworked so to have it granting replacement for most common artillery pieces in any Army.
JastaV