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

My 2nd G30SF also had precision issues plus the WORST set off pull of ANY Glock I have at any time owned, and I couldn't accurate it working with this setup regardless of what I did and well over one,000 rounds of trying to fix it and “split in” the gun (which I haven't had to do with any Glock prior to possibly).Maybe a dumb concern, but may b