Yes, but how would they go about classifying what can and cannot be sold to minors? It's easier for the mods to use the same coding for the AEG and spring/gas gun restriction than it is to create a new section devoted for underage parts.
Correct me if I'm wrong.
G&P M4 Sopmod
G&P Mk18 Mod 0
KSC USP Tactical (System 7)
Tactical Airsoft Combat Operatives