I am looking at buying a peep sight for my Henry 22 cal lever gun. The company makes two. one that mounts right in front of the receiver in the holes already drilled and tapped in the barrel and one that mounts on the rear of the receiver and the receiver has to be drilled and tapped. The one that mounts on the barrel would be about 4 to 5 inches further away from my eye than the one that mounts on the receiver. Is that going to be too far from my eye ? How far away from your eye can a peep sight be mounted ?