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Air Arms s510

Do a search for regulators. There is a fair amount of discussion about this on this site.
A regulator will make all the shots very consistent from shot to shot until the air pressure gets below the set point of the reg. This is very good for long range accuracy for target shooting where you want all shots to hit the same spot with out having to compensate your hold. 
As far as shot count goes, it will not give any more shots. Depending on the design of the gun it may give less as it takes up space in the air chamber.

Good luck!