Can anyone tell me about trigger kits for the Ruger 22/45 lite? I read somewhere that you didn't actually need a whole trigger kit, but just some parts, but $30 bucks, or $100, the trigger has to be improved! I have a red dot on it, and intend for it to be my pine squirrel slayer so I can take care of those pesky rodents when elk hunting! Thanks for any advice.