Mixing corny kegs

I've inherited a single pin-lock corny keg, CO2 tank, and regulator.

If I want to set-up a dual tap system and tower, is there any downside to getting a ball lock corny as the second keg?

I'm scrounging craigslist for whatever is available.

Thanks!

none at all

No problem with that. Just be sure to use MFL disconnects so that you can easily swap out disconnects when changing kegs.

Edit: I just re-read your post and picked up that you will have two kegs for a two tap system. In that case, MFLs are not absolutely necessary, but I'd use them anyway. It'll be especially useful when you inevitably figure out later that you're going to want more than 2 kegs for your 2 tap system.

Yes. I'm finding out now how helpful it is to have more kegs than taps. I have some of each, too.

It will not hurt to have a mix of types, it is preferred to stick with one type for the sake of not having to change out quick disconnects. Honestly though, if the beginning of my keg collection was a gifted pin lock I would just have stuck with pin lock kegs. They tend to be cheaper. Additionally, you could always buy new posts and switch your pin lock over to ball lock if you are dead set on ball.

My collection consists of ball locks and a couple inherited sixtel sankeys.