[metallicafatcat]

I'm not sure I understand your Idea completely but props for even trying it out. The one thing I'm confused about is if your idea is based around the the BB stays on the bottom of the barrel? If you could draw up some simple paint schematics that'd be a great help for me to understand it.

 

[metallicafatcat]

Now that I look at it, you have some testing ahead of you. If the O-ring really does apply as much hop up as mentioned, you may have the rounds jumping into the silencer and not exiting because the BB's will only be influenced for a small bit before leaving the unit.