My new M4A3 16" Bushie is shooting WAY high and left. Barely hit the upper corner of a 24"x24" cardboard backer with 25 meter target in the center of it. Front post had to be elevated to the point of being loose, and the rear sight has to be cranked all the way to the right.
Next I mounted a Nikon scope, which promptly ran out of adjustment down and right. That tells me that something ain't right, given that both sighting systems need the same adjustments.
Bushie agreed that it's too much adjustment and asked me to send in the upper half. They said it could be a bad muzzle crown, too tight front sight pin, a rifling problem, or a bad barrel/reciever fit.
They expect two weeks turn around time. At this point, I'm pleased that they quickly offered to check it out, and didn't blame it on my shooting ability or the ammo (both of which are good). I've never had to send any of my other Bushies in for warranty work, so I'm hoping for a pleasant experience.
Edited because I can't spul....spal....spell!