The pictured assembly is housed in the pump handle of the air rifle.
A walnut forearm stock (not shown) slides over this portion of the
air rifle. During the pumping action, air is delivered under pressure
past the check valve assembly and into the air-spring chamber. When
the air rifle is completely un-charged (such as following the initial
assembly), between 40-55 pump strokes are required to both charge
the air-spring and fill the firing chamber. This is a one-time requirement.
Subsequent shots require between 6-10 pump strokes depending on
the power setting.
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