I don't know if it's the same rifle but here's an ad off of gun-deals for $619.00. It's an entry level rifle and if I remember right, it doesn't accept any accessories. Could be wrong about that.
I purchased 3 of these bargin bin guns back before the market went crazy over ARs. You don't get a choice on the brand of lower(I received 2 CMMG and 1 DPMS). None of mine appeared to have been used. The only blemish was a small rub spot on the front of the mag well on the DPMS. I would not hesitate to do business with them again,