BASIC_RELIABILITY_ODDS in CTHConstraints will be set to 100 upon startup if user sets between 100 and 10000 as advertised in the description:

Quote:

; This is the basic chance PER SHOT to lose 1 point of weapon condition with each
; bullet fired. The formula for this chance is 1 in BASE_DEPRECIATE_CHANCE, so higher
; values result in slower degradation.
; The default value for OCTH is 15, but NCTH requires a **much** higher
; expenditure of bullets, resulting in severely-reduced weapon condition after every
; battle. Therefore, the default for NCTH is currently 150.
; Valid range is 0-10000.
BASIC_RELIABILITY_ODDS = (some number)

This bug's been around for at least a year.