I'll make a picture for you guys tomorrow.
The bulletnose is the airtight cilinder for the counterpiston.
It's hollowed out.
One end had to be blocked off to ensure the low pressure area in front of the piston.
The shape of that side is rounded off to help air flow around it.
That's how I ended up with the bulletnose.
I just tried it with an 11 mm I.D. barrel.
A thick nail and caulktube-tip cut to size served as a dart.
It was pretty cool...
At 40 pumps the nail went into solid hardwood from the side ( top of the grain is easier) 20 mm.....I have tried a commercial airgun on that block ( from wich Old Shatterhands' stock was cut) and.177 cal balls made just a dent and popped back out.
The coolest thing is:Absolutely no
sound apart from the " dook
" of the nail cutting into the wood.
I don't really like loud noises...so this is a plus.
Now I can shoot it anytime!
Although a large boom would have re-assured me the valve was doing what it is supposed to...