Under Cocker
In a pump marker it is a term used to describe that the pump is
attached to the bolt, not by two arms but by a rod under the barrel. The
undercocker is preferred by some players as it reduces the number of
holes milled into the body of the marker, this eliminating an entry point for dirt, debris and paint.
Upper Receiver
The assembly of the paintmarker that includes the barrel, main body,
bolt, hammer, valve and part or all of the trigger mechanism.
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