First I would ask him if he reamed it at all. See if you get anything resembling a straight answer.
Second - you can check the barrel with go/nogo gauges to see if they protrude the correct amount from the breech of your barrel (forget what the correct figure is for each - sure you can find it).
As far as the baffle - it moves around but isn't floppy if that makes sense. It is tensioned by a spring loaded captive ball and should "click" into a longitudinal groove in the rear of the bolt body when you rotate it past the groove. If it doesn't "snap" into this groove - he lost the ball.
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