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Because there's no back pressure to resist the piston head from slamming forward in to the front of the mechbox at full strength.
So in that sense, no, it does NOT do the same thing as when a BB is in the chamber. The BB does provide some back pressure.
If you MUST dry fire for the fun of it, do it with the muzzle cap on. It's designed to simulate the back pressure a BB would provide.
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