Quote:
Originally Posted by lurkingknight
take the gearbox out of the gun
cycle the gearbox or reset the gears until the nozzle in full forward position
align the gearbox with the body and push it in slowly. observe the nozzle through the hopup feed tube. When you push the gearbox all the way in, the nozzle should not stop and go all the way into the hopup chamber.
To test if the nozzle is properly sealing to the bucking, partially block the barrel and put a piece of tissue paper over the feeding hole. Cycle the gun in semi. If partially/mostly blocking the airflow from the barrel and the tissue shoots off with some force, the nozzle is not sealing to the bucking. So either the hopup unit is longer than the original or it's holding the barrel assembly farther away than stock.
Why would you want to change hopup units anyways? If there is nothing wrong with the one you have, there's no reason to change it. The whole misconception people have is that metal is better. no, not necessarily.
CAs should have come with a metal unit anyways unless it was a sportline, then I'm not sure what unit those things come with, but I've only ever seen a metal unit on a ca.
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Thanks for the tip, that is a great idea! I'm changing hop ups because my guns Fps varies bye +- 20 and I have done all the internal mods for compression. Stretched O ring, 8 port lonex piston head, lonex double seal cylinder head which I siliconed to the cylinder, tapet plate is filed down, and during compression test with the nozzle forward in shooting position I cannot push the piston in all the way, so that area is good. I use permatex on my bucking as well as tephlon tape and dental floss, the bucking is a prommy red, on a prommy barrel with r hop. So my thinking is that maybe the stock hop is not perfectly round, since it's two piece, and therefore not sealing completely. Or I botched the bucking when I flipped it, but I'm thinking fps would be much worse if the bucking was botched. Unless I'm missing something? I am going to get prommy blue straight bucking next week to eliminate any bucking issues and borrow this down further. My goal is +- 2 fps