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

I'm not sure when there is Significantly I can do to further improve on it but, if there is I would like some Suggestions from Individuals of you who've modified their pocket tanks. Apart from night sights that's an obvious up grade with the common glock sights. Many thanks in advance.In my opinion, a lot better than inventory. The result in bar is