I see they have both 5.56 and .300 BLK uppers for sale for $250 (minus BCG and CH).

I have a spare New Frontier polymer lower sitting in my safe that I bought about...ohh 2008'ish that it is about time to do something with. It doesn't need to be a tack driver. I want something that will work for shooting poodles and paper out to about 300'ish yards maybe a little farther if possible. Not duty grade, <500 rounds annually, maybe a carbine class once - maybe (I might just buy a Colt and use this as a backup to the Colt).