I decided to reduce the size of the 300 yard combat peep sight on a No 4 Mk II to get more precise groups when target shooting. I did not want to make a permanent change to the Mk II sight. The solution was to turn an insert that could be installed into the original peep with a bit of contact cement. Below is a drawing of the insert and photos of the aluminum prototype and the the final steel version. In my case I have made it a .055 hole. You can use any size you wish if you make one. You do not have to have a lathe to build one, if one takes time it can be made on a drill press.
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