Currently I did a little research on regulated pcp air rifle designs.I'm thinking about an more or less "ideal" regulated pcp rifle design with a closed "pre-chamber" that get filled with regulated pressure from the air-reservoir after each shoot.The exhaust valve then dumps all the air out of this pre-chamber into the barrel with each shoot. If it's well made this design should be pretty constant.Can someone tell if such design allready exists ?I couldn't find something like that by know - possibly I just don't have the proper term to search.Greetings Martin