[JDoorn]

1st question: can a 2 piece hop up unit be replaced with a 1 piece with out any other modifications?
2nd question: is there a trick to removing the inner barrel and 2 piece hop up from the gun. It seems to be held in by more than just friction... Looks like there are a couple split pins going in through the outer barrel and possibly into the hop up somehow.
I may be way off, I know there is an amazing amount of knowledge in this forum's users heads. Any advice is greatly appreciated.
Thank you