Originally Posted by Mr.Hitman
More upgrades and replacement parts for blowbacks.
You can also clean the pistol easier for blowback by taking off the slide, barrel, hop-up, etc.
Yup more upgrades and replacement parts.
But you can also easily disassemble NBB's (TM MK23 for example), and they probably don't need a cleaning nearly as often because they have so few moving parts.