+1 on what OneOunce explained .... and the real issue is if you end up with a gun where one barrel shoots 6"high and left at 21 yards / and one is 8" to the right and low at 21 yards ....now what do you do ??
You may end up with 1 or 2 out of 10 of these guns that will hold up / and shoot accurately for 5,000 shells or so .... or you may get one of the other 8 ??? :barf: