This uses 1/2" brass nested into the bolt and secured with epoxy and goop. Inside of that, I wedged a piece of 1/2" to act as a dart tooth. This was done to prevent jams when loading darts into the firing barrel. I don't have the length of the 1/2" brass but it sticks out about 3/4" from the stock bolt (not quite half way on a clip). A cut down pen cap was used to secure the tooth and keep it secure. (The pen was the uni-ball vision line)
The firing barrel is 17/32" brass with tightening rings and is 9" in length. I've coned out the barrel slightly to act as a guide if the bolt is slightly off.
The completed bolt
The firing barrel
Assembly with a clip
This is air tight and once I actually put in a [k26] + LS spring combo, it's breaking cardboard.
Ranges: Averaged 85ft with single BB stefans
Edited by popatachi, 08 March 2010 - 05:03 PM.