None of the Umarex .68 guns are adjustable in the way we think of it.
The way people have been boosting the velocity output of them is by taking them apart and drilling out valve ports or removing the flow restrictors that Umarex purposefully incorporated into the designs to make them legal in Germany and other European countries.
https://youtu.be/WRtwRi9ES8M
The way people have been boosting the velocity output of them is by taking them apart and drilling out valve ports or removing the flow restrictors that Umarex purposefully incorporated into the designs to make them legal in Germany and other European countries.
https://youtu.be/WRtwRi9ES8M
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