Umarex 629 6in smith and wesson

[plisko]

Hallo I have the umarex 629 6inch barrel since I got it it's been realy under powered I have checked everything and seals fine barrel all fine. I have umarex colt python that plastic and cheaper and power is double of the 629 any one know how I can adust the power of the 629

 

[marflow]

when a CO2 gun doesn't leak it will not affect power but when co2 leaks from the source out the barrel it would
and that is where you need to look
get a parts diagram and check that all seals are in place and not damaged
but i do not know the pistol to know for sure