Try simpler solutions first like adjusting the hopup and cleaning the barrel. Then try out heavier BBs. Don't assume the worse just yet, sometimes its not a big issue with no need to replace or upgrade.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)