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

I put a Tarran Tactical package into a gen three g23 and It can be now Tremendous lite but I however could not hit nearly anything with it. My Good friend could shoot it really well but I struggled. Lastly I adjusted the inventory sights into a Dawson Precision Mounted Opposition Sight Set and now I do very good with it.I'm truly trying to buy a Ge