.25" brass tubing this time.
Coring the hole.
I cut the cup end off with a knife.
Much better than trimming by hand.
Turning a shank and the taper.
Checking for depth.
Shoulder, threads, check!
Looks like it works.
Cutoff.
Cleaning up the face.
Slotting the head for a screwdriver, .032" wide and deep.
The piston head, all done.
It stopped raining long enough to run a few shots over the chronograph. With 10 pumps, CPL 7.9 gr. pellets, I got a very consistent 757 fps (+/- 3fps). That's a 17 fps improvement over the o-ring! I would have been happy had it been a bit slower. I'll be trying this mod in all the Crosman pumpers from here on out.
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