Using a 401K for a Rental Property

[Nader Hachem]

So i'm in between switching jobs right now and i'll have to transfer over my 401K. I have about 38-43K in my Traditional, pre-tax 401k. While listening to this weeks BiggerPockets podcast, they mentioned that they got started by using their 401K. I'm looking for my first deal but have been on hold because i'm saving up (Looking to do the normal 15/20% down through a convetional loan). 

What opportunities would there be to use my 401K as a down payment for a rental property and are these good options to explore? Would I have access to the rental income or will they have to stay in my 401K until 59.5. Anyone have experience with using their 401K for a (first) property? What were the advantages and disadvantaged?