I have a Stag 10 in 6.5cm. I have gone threw everything trying to get it to shoot. I have also sent it back to stag with no luck. I was a huge stag fan because they offered left hand ar's, however I will never buy one again.
I'm pretty sure when i sent it back to them that they never even fired the gun. they said i changed the butt stock so warranty was void.... well i bought it as their "bones" kit which has no butt stock or fore grip. sorta hard to shoot it with out these.....
Basically came down to I need to buy a different barrel as this one is crap. Mine is an issue with the chamber because when I rack a round in it, then try and eject it i can barely get the round out of the chamber it is stuck so tight.
Stags "warranty" and barrel guarantee's are a joke.