You could start by lubing it, changing the battery & putting your settings to stock.
It what way was it shooting bad? Inconsistent? Breaking paint? Drop-off? What? We need more info.
Some Invaluable Words of Wisdom:
A wise man's heart directs him toward the right, but the foolish man's heart directs him toward the left.
“If you're not a liberal at twenty you have no heart; if you're not a conservative at forty you have no brain.”
-Sir Winston Churchill
"Lousy Democrats."-Homer J. Simpson