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

My 2nd G30SF also had precision troubles as well as WORST cause pull of ANY Glock I have at any time owned, And that i could NOT suitable it applying this setup regardless of what I did and well about 1,000 rounds of endeavoring to correct it and “break in” the gun (which I have not needed to do with any Glock prior to either).I'm Perfectly kno