Hold your horses Mongoose!
I talked to the guy and he apparently hasn't made barrels for the WE rifles just yet despite what folks have told me. However, I am going to make a pilgrimage to his place sometime soon and help him bang out a barrel with a few to-die for features. (He and I both live in the Philippines but are from different, far-from-each-other regions)
This is the one I'm having custom made:
6.00 cm inner diameter, CQB length. (carbine length will also be available, as well as custom lengths) (less space for the bb to bounce around in the tube, better air compression)
built in noise amplifier (optional)
porting to reduce air turbulence around the bb once it leaves the barrel. (means even more accuracy)
and an outer diameter adjusted to fit snugly inside the outer barrel to reduce vibration (even more accuracy)
Once my prototype is made and tested, it will be made available for sale.
This might also cause you to salivate:
http://www.popularairsoft.com/reviews/x ... er-kit-m4s
The kit can also be made for gas blowbacks.