and threaded with a suppressor.. take a look at the left side of the AR. it should have serial number, model , name of company, and place of manufacture. possibly a rollmark on mag well.. this should tell you what it is.. as fatr as the inside i dont know.. looks almost like someone tried to do a repair of some sort. possibly had an issue with the rifle and thats why it got ditched... did you see it shoot, or shoot it before your purchase?
honestly looks like you got the wrong end of that deal...
I have been a silent witness
to all of America's finest hours.
But my finest hour comes
when I am torn into strips and used as bandages
for my wounded comrades on the battlefield,
When I fly at half-mast to honor my soldiers,
Or when I lie in the trembling arms
of a grieving mother
at the graveside of her fallen son.