I'm building my son a bbmg,
Heavily influenced by the Ultimate Inline, one of my all time favourites..
With a twist though..I'm using a 1/4" QEV and my modified 3/8" large diameter pop-off wich I have turned down and rethreaded to fit the QEv directly.
This not only adds a cool daka-daka, it also allows me to tune it's powerlevel ( way down!)
The inside "out"port of the QEV has been cut down so an aluminium piston fits in.
Air can now exit the QEV in a single turn.
Anyway..it runs off unregged CO2 for the moment.
The shoulderstock detaches and will serve as the plug wich holds the plunger.This I still gotta make.
I plan to modify a brightly coloured waterpistol body and fit the thing inside.
Everything will be bondoed up so it'll look original.
The bits I need to fill in will also be painted in some bright colour so it it obviously a toy.
The heatshield will be shortened to fit..
Together with my 12 gram adapter this thing could be taken into the woods for some fun plinking.
Since this is for my 9 year old son power will not be of significance.
But it will be one hell of a toy for him!
When he gets older I can easily up the power.I got springs to pop it at over 300 psi...
The blowgun is rated to 200 bar ( not psi!!) and the vortexblock is a single piece with the front plug and is made out of roundbar I poured myself.
It will be able to withstand 300 psi shots if I were to go up that far..maybe if dad wants to borrow it sometime...

Oh..ans the QEV-pop-off-vortexblock thing works...I've already fired it..