Actualy you might not have to make a new powertube at all, there is about a little over 12mm of the bolt between the tip of the powertube and the tip of the bolt. Now remember since the paintballs are smaller the breach will have to be sleaved, that means that the bolt will have to be enlongated by about 2mm (just an estimate, didnt feel like doing the math) or the smaller paintball could roll backwards towards the bolt which could allow the next ball to partialy load into the breach, which would cause breaks/jams in the gun.
Now that 14mm of bolt is the part that we would have to make smaller, the rear part of the bolt still covering the powertube would still be its origional size. As for barrels, you could make a sleave for them as well. That way you would still be able to use your barrels. Or you could just make a barrel that could screw into the ule body but it would just have a .50 cal bore.
The only thing im not sure about is I never took the time to find out just how far the standard mag bolt moves forward. As long as it doesnt move to far foward when firing you wouldnt have to mod the PT at all, just new shims, carriers, and bolt springs.
Now that 14mm of bolt is the part that we would have to make smaller, the rear part of the bolt still covering the powertube would still be its origional size. As for barrels, you could make a sleave for them as well. That way you would still be able to use your barrels. Or you could just make a barrel that could screw into the ule body but it would just have a .50 cal bore.
The only thing im not sure about is I never took the time to find out just how far the standard mag bolt moves forward. As long as it doesnt move to far foward when firing you wouldnt have to mod the PT at all, just new shims, carriers, and bolt springs.

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