Hello once again I have a question for you guys. What am I looking at here. I heard of dual marked receivers. But is this one real. Bnz and byf. As you can see there is no letter suffix and it says markings were added later to match. Is this all a fake rifle. No other stamps that I can see anywhere didn't get close ups but what I can see on the barrel it doesn't look like any other stamps. Have any of you seen this before