LCT VSS air seal problems... When the gun is apart, air seal seems good, but I only get 350 FPS from an SP120 spring (hop completely off).
Pic 1, gearbox in half, no barrel - near perfect seal - I can barely push the piston in with my finger over the end of the nozzle. When I stop pushing, the piston returns to original position.
Pic 2, gearbox in half, hop/barrel attached to gearbox - near perfect seal - I cannot push the piston far with my finger on the end of the barrel. When I stop pushing the piston, it returns to original position.
Pic 3, gearbox, hop unit and barrel assembled in body of gun - not sure best way to test, but I cannot blow down the barrel, so assuming good seal.
SP120 spring, and the best I can get is about 350 FPS with a 0.20g, worst is 250 (depending on combination of parts below).
Anyone have any ideas?
Tried with all combinations of the following:
- Stock hop unit;
- Stock nozzle;
- Stock barrel;
- Stock hop rubber;
- Combat Union hop unit;
- Combat Union nozzle (came with unit);
- Prometheus 6.02mm barrel;
- Prometheus purple hop rubber;
- Maple Leaf Macaron Yellow hop rubber.
I've found the stock nozzle doesn't seal very well with the stock cylinder head, but the Combat Union seals perfectly. And the nozzle and hop unit only seal in pairs (i.e., stock seals with stock, Combat Union seals with Combat Union) - mixing and matching gives air leaks.
(Apologies for some pictures being upside down.)
Thanks in advance.