How can I adjust the hop up on my air soft gun with out dis assembling the gun?

Crossman Stinger p9. When shot curves up and to the right. Severly. Every once in a wile it is normal. But 3/4 of the time its ridiculous. Can I adjust it without takinga apart the gun.How can I adjust the hop up on my air soft gun with out dis assembling the gun?no unless you have a hop up button check you manual.