It's not so much about power, as it is about preload.
August 17 2012, 10:57 PM
"Preload" is the force required to fit the mainspring into the uncocked gun, and the amount of force required depends on the particular gun and spring in question.
In some (quite powerful) springers like the TX200, the force required is quite small (perhaps only 10 or 15 pounds), making it easy to disassmble and reassemble the action without a compressor. In other (even less powerful) springers, it can be 50, 100, or more pounds, making it not only difficult but actually dangerous to attempt assembly without the help of a compressor.
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