HOW DO I BUY A GOCK 30 GEN 4 ONLINE THINGS TO KNOW BEFORE YOU BUY

My next G30SF also experienced precision problems and also the WORST cause pull of ANY Glock I've ever owned, And that i couldn't suitable it working with this setup no matter what I did and perfectly in excess of 1,000 rounds of wanting to resolve it and “crack in” the gun (which I have not needed to do with any Glock prior to possibly).I am a