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Old 04-20-2013, 07:23 AM   #9 (permalink)
3022
Banned
 
Join Date: Jul 2006
Location: Czech Republic (middle Europe)

Then I have tested different cup seals. After 4 or 6 tests the optimal shape looks be such like:



- minimal OD (to fit in the existing valve nut) and rounded back edges, with only minimal seating space for the spring

And it has such like final effect:



- 47 consistent shoots with avelerage muzzle velocity 257 fps, and total 469 Joules of KE in 50 shoots per 12g.


...bolt modification should follow. Im Heading for 500+ Joules / 12g.
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