Just bought an M&P full-size original 9mm and the trigger is truly atrocious. 8 1/2-pound pull and gritty as hell. Short of buying an APEX or other aftermarket trigger kit, is there anything I can do to lighten/smooth out the stock trigger? Gunsmith says I'm SOL and trigger upgrade is only option. S&W customer service quoted me 150 to upgrade to a 2.0 trigger. I'm on the verge of selling but want to give the gun a chance to live up to some of the rave reviews I've read.