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

My 2nd G30SF also experienced accuracy challenges as well as WORST induce pull of ANY Glock I have ever owned, And that i couldn't correct it applying this setup no matter what I did and perfectly above one,000 rounds of wanting to fix it and “break in” the gun (which I have not needed to do with any Glock right before either).Perhaps a dumb pr