Just shoot it and see what it does dude...
Bring and use different ammo... is it keyholing? NO? Good...is it giving good groups?
Can you install a scope mount?
I see a bayonet lug.. can you install one?
Did you clean the barrel and see if it is good?
If it was mines and if I bought it for that price, I would send it to In Range or someone else and go full blown 9 yards conversion with the markings and everything else.
If you listened to every review out there, you might as well just go buy a BB gun and don't bother with it.
Did you break down the magazines? Clean it out? oil it? Does it cycle?
take it out and see what it does, dude before listening to every land whale commando and the reviewer clowns.