I am on the waiting list for a 50 upper and am looking for an AR lower. The only place that I can find them is the TM site and they are out of stock. That is unless I get an 80% lower. I have considered just getting a regular lower and grinding down and filling the mag well but that seems like too much for just a beveled front look. Anyone know of any other options?

Look up the SMOS lower. It's a single shot lower beefed up specifically for 50 bmg uppers. I have one and like it much better than the standard lower that was on it. Not cheap at $300 but worth it.

I saw a complete plastic lower online for $100 yesterday. At least at that price I wouldnt feel bad about filing down the magwel. Will probably just use my spare aluminum one until I make up my mind. Either that or I will just do the 80% thing.