HOW DO I BUY A GOCK 30 GEN 4 ONLINE FOR DUMMIES

My second G30SF also had accuracy challenges and the WORST set off pull of ANY Glock I've ever owned, And that i couldn't accurate it utilizing this setup whatever I did and well over one,000 rounds of looking to take care of it and “split in” the gun (which I haven't needed to do with any Glock right before either).Several set off bars as well