A1 post ban club foot.It rocks back and forth a little on the tube,is this normal?The tube is tight and does not move.

are you using it with a full length of carbine buffer tube?  if it's a full length, there should be no movement at all - just make sure you're using the A1 screw, not the A2 screw to hold it in.  if you're using the pin to hold it in a carbine tube, slight manufacturing tolerances in the latch pin holes *might* account for a bit of movement.  however, my A1 vltors have been tight on both colt and vltor carbine buffer tubes, as well as colt/bushy rifle tubes.
cheers,
MM

I purchased the carbine(colt)buffer tube at the same time and the stock just stays on with the removable pin.No screw in the back.

Not that this is going to be much of a help, but find out what you can, try what's recommended, and rest easy knowing that whatever happens, good or bad, Eric at Vltor is a standup guy, and as long as your doing what you have to he'll do what he has to to make sure that Vltor's working out the way it should.