["Brand new" Saiga 12 question]

Just received a "brand new" Saiga 12, not sure if this is normal - but i noticed that when i tilt the gun back and forth, something is sliding back and forth in the foregrip or something. I know its not in the barrel or gas tube....

Also, does the gun get factory tested? I noticed there was a little bit of residue from an obvious use of at least 1 shell down the barrel. (Bought it ftf trade, didn't get the best look at it as it was pitch black outside in the middle of bfe - he said it was brand new but who knows right?)

 

It seems like a minor thing, im overall happy i got it and can't wait to do conversion/mods

[Conversion price in todays market?]

I do not trust myself at all to convert a saiga 12, so im interested in knowing what the cost of a full conversion would be from a gunsmith or something.

Trigger group moved forward, barrel cut down to 18 inches with a permanent muzzlebrake, pistol grip, new retractable stock, maybe a new quality trigger