[bobgengeskahn]

On airsoft, bull barrels are overkill and 99% marketing. Good spacers and a soild outer barrel is all you really need. Real steel is a whole other story becaues the forces in question are obviously higher, so real steel focuses on creating a consistant repeatable vibration.

 

[bobgengeskahn]

Yeah, I don't know about the receiver side threads, but I know that even finding the right 14mm CCW tap or die for the muzzle is near impossible. At least, at local shops and quick internet searches I can't find them, but I'm sure with persistance you can find one somewhere... or if you really have skills/connections you can make them.