I would agree with other members here, do not buy that.
If it have a shorter than 16" barrel which it would be a SBR, you would need to file SBR paperwork with a fee of $200 and currently about 6 months (or longer) of waiting for processing.
If it have 16" barrel and at even at the lower price it will still require a lot of rework and upgrade, like replacing the front sight post with a 0.040" longer post, properly staking the gas key screws of the bolt carrier, replacing the bolt extractor spring kit, torquing the buffer tube castle nut and staking the castle nut and replacing the standard carbine buffer with a heavier H buffer.
For a lower cost AR I would just recommend getting a Palmetto State Armory carbine and wait for their special sale, they're a newer manufacturer but are using high quality mil-spec parts like FN made barrels, mil-spec parts from the same sources as other major mil-spec brands, and they have good customer service.
Or for just a little lower price of a stadard model Colt LE6920 M4 carbine you could get a lightly used LE6920 carbine, they're very durable and would last for a long, trouble free time.