Dear JeremyKS:
Now this is not national match at Camp Perry so evaluate accordingly!
While going through basic training at Ft. Knox in 1982, I was issued a Harrington and Richardson M16A1. Being a basic training "pool" weapon, it recieved more than its fair share of abuse. The upper and lower were so loose that the weapon rattled all the time! No Kidding at all! The reality of the accuracy of the weapon was that I qualified Expert right handed. While I was qualifying, the range NCOIC realized that I was left eye dominant by my actions and made me immediately go back through in the next firing order and qualify shooting left handed. I also shot Expert left handed.
My point being, that is the most loose weapon I was ever issued. But that H & R was a shooter! It has been my experience that the tightness of fit between the upper receiver and the lower receiver has little impact on accuracy.
Redhound80