Haha yes this is still in pieces in need of a little valve work to stop the blowback - a groove and a couple of orings should work but just havent had the time!

Cool projects! A smaller transfer port can make gas use more efficient, but some space helps with pressure. Placing the barrel port directly over the valve should improve power. Excited to see what you build next!

Haha yeah, not given up yet! Its got the potential to work so no reason to stop now!

Function is there, its just fine tuning the rest - valves are designed to blow back and thats proving difficult to change as the hammer hits from behind the gas - theres a bit of gas flow past the pin. An o ring should help stop it, if not i'll deal with it blowing back the hammer ready for the next shot.

Last test was 11 footpound so its not bad in itself, i changed to a new valve that didnt have JB weld patching it and also added a small expansion chamber so will see how its power is going soon. Atleast I have a decent supply of co2 on hand!

 cheers mike

Not fully tested yet but been a fun project. Not making a match rifle so closing the group a little will be fine for me.

I need to get a stock to fit it as its a little hard to shoulder comfortably to get your eye right.

Its light weight and plenty of length to find balance - holding in front of the hose if pretty comfortable

The bug buster is a good little scope - ideal for this type of thing as well as your backpacker 1322 idea.

Well, back into this project - I finally got the bits done to get it together and running.

An alloy insert in the paintball bolt creates a narrower transfer port (gas has a long way to travel from the valve to the seated pellet)

The barrel has orings and the bolt seals over the barrel readu for the shot.

At the moment it needs some valvbe work - it still blows back after most shots; as a paintball gun its semi auto (this would be ok if it was machined to accept a multishot mag!!) but as ainbgle shot its wasted gas.

I have another valve on its way which i will just need to fill a hole to stop the blowback, then balance the spring strength to stop any valve bounce.

The barrel is around 19" with a couple of inches protruding into the massive 'fuel filter' suppressor.

As it is now the experiment was to see if a paintball gun sould be made to shoot pellets, and it definitely can. Accuracy needs to be tested but its all firm with no flex so that should be ok.

Consistency will be improved once the valve is sorted.

In terms of power, as it is its pushing out 11.3 footpound with 18gr JSB, thats with the wasted gas blowing past the valve..