Is your 10/22 a very old or very new model? Is it new, or used? If used, did it still have the original sight in the rear dovetail, or a replacement sight (could be a sign that the previous owner had already filed-off some metal in the dovetail to get a new sight to fit)?
Apparently, some other folks
have had problems with this sight set. Here are a few reviews from MidwayUSA's website page for this product:
http://www.midwayusa.com/product/898...nd-green-front
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By Lowell
from Fargo, ND
"These sights are o.k. but there were a few things I don't like:1.) The rear sight was too loose in the dovetail. I could slide it right through by hand with very little resistance. I had to use shims and loctite 680 to get it installed correctly. My factory sight is snug so I'm not sure why it didn't fit."
...
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By R
from North Little Rock, AR
"Front sight fit fine. Rear sight fell right off. HIVZ is sending me shims."
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