=== Universal modifications ===
This list details services that are generally applicable to any firearm (including [[Customs:Major|Major Customs]] creations)most firearms, unless otherwise noted.
==== Barrel threading ====
** [[Steyr TMP]]
** ''[[Norinco QCW-05|QCQ-05]]''
As a rule of thumb, this service does not apply to weapons belonging to a [[Customs:Major|Major Customs]] family. You should instead check each family's respective barrel options for threading options.
==== Durability upgrades ====