...and acts like a fulcrum point for the other end. Since the point is towards the muzzle, that is the natural non drag direction. Think of a spring loaded broad head arrow. Goes in one direction nicely, but pulling it out there is natural drag due to the design.
It must be noted that cocking the hammer/striker too swiftly produces the drag as well. With a nice, even pull there is no drag induced. In other words, calmly is the method. Cocking effort is low, which helps in the feel and approach.
Notice how the Hammer/striker has milled flats on either side of it? Only the top and bottom of the hammer ride, or touch in the tube. This means less friction via contact. The flat areas are key in allowing the HDD to work, as more of the HDD device/material is exposed on those flat areas.
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