Can you buy guns online?

I do understand for certain sweepstakes and contests where guns are a part of a giveaway you need to have the address ready for it to be shipped to an FFL dealer.



Is it legal for people to sell guns online if the same scenario is set up?



Does anyone have any particular recommendation for glocks? I'm looking for a 3rd gen 9mm and 40.



Thanks for any help.

Can you buy guns online?