Small upgrade, big improvement - Williams Gun Sight Williams Fire Sight Set For Ruger Mk Ii,iii,iv 22/45 Lite

These sights are outstanding, made from quality steel and made in the USA! They're easy to install without a gun smith. I bought two sets to upgrade my MK IV 22/45 and my Stainless Steel Target model. The rear sight only needs to swap the sight blade so you don't have to push out the dovetail base. Height and windage are adjustable with firm clicks and will hold their set positions. The fiber optics are small but bright, making target acquisition much easier than the factory sights. These will fit on all Ruger MK IV series pistols EXCEPT those with the threaded barrel option. The William's front sight is slightly longer than the factory sight and the front edge rests on the knurled thread protection cap. This prevents removal of the cap unless you first remove the front sight. This is the only reason I gave it 4 stars instead of 5. I wish they would have machined it to the specs of the factory sight dimensions.