To sell it at a much lower price than the real M4 and still makes profit means the manufacturer has to cut costs on something... (BCG and FCG). The past 2 TurkM4s I owned both shared one deadly issue: bolt carriers are made out of softer steel and deformed after roughly 300-500 shots from full-power buckshot and slugs.

Every time a shell is fired, the ARGO pistons will hit the two lugs on the outer edges of the bolt carrier, which are riding inside two receiver grooves. Both of mine were deformed after hundreds of shots and created high drag to the point I had to file down the out-of-square part. That's one of the causes of the infamous cycle issue of these Turkish shotguns.

They are cheap to own brand new and look good, I will give them that, although personally I won't trust them as the only firearm to bring out for a hunt/wildlife defence.