Most Skinner Receiver Sights are shipped with a .096" Aperture. This is a good all-around diameter that allows quick target acquisition and accurate alignment. Our BARREL MOUNT sights are shipped with a .125" Aperture installed. For the forward mounted sights, a .125" is the smallest practical size for normal shooting.We recommend the .040 (fine) for target shooting in good light and the .125 (large) for dim light hunting. Remember, you can always remove the aperture completely for a .200" "Ghost Ring" effect. This is useful in very dim light and for up-close encounters with dangerous game. You can also order several different size apertures and use them interchangeably as light conditions require. SKINNER SPECIAL - Purchase all 5 Aperture sizes for $50. Or - Get the “DELUXE” SKINNER SPECIAL with Aperture Storage Block for $60 APERTURE STORAGE BLOCK MACHINED FROM ALUMINUM BAR-STOCK, SMOOTH FINISHED, GOLD ANODIZED TO FOR A NICE CONTRAST. (Compliments our BLACK GOLD sights AND our all BLUE/BLACK sights nicely) We machine our apertures from solid steel bar stock. The holes are precision drilled ROUND holes to allow your eye to work its centering magic. If crosshairs and fiber optics around the aperture were an advantage, all competition shooters would be using them. But they don't. They use precision round holes, just like these. Remember, the goal is to look THROUGH the hole and forget about it. Anything that draws attention to the hole, be it a brass ring or ? is detrimental to accuracy. Our apertures are threaded 12-40 and will fit most other manufactures 7/32-40 sight mounts. "Smaller apertures will increase the depth of field allowing even old eyes to have the front sight and the target in clear focus. Larger apertures will still afford some of that function but to a lesser degree as more light is let through the hole. No worries... Even a slightly fuzzy front sight is right where you see it. Use it. Focus all your attention on the front sight and its alignment on the target. I might use a .070" while sighting in, then a .096" or .125" in the field for average conditions. When it gets dim or I want an even faster acquisition, I will put in a .155" or go full "ghost ring" by removing it altogether. Having several apertures available makes good sense." Andy
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