You'll need a 7/32" drill bit, a 7/32" x 3/8" roll pin, and a center punch. Figure out where you want the sight to sit and mark a spot on the underside of the sight that aligns with one of the three stop pin holes on the gun. Then find the center, mark it, center punch it, and drill a 7/32" hole 1/4" deep into the underside of the sight being careful not to drill all the way through. Insert the roll pin in the hole and grind it's length down until the sight will sit squarely on the rail and the pin reaches the full depth of the recoil stop pin hole on the rifle. A drill press is preferable, but it can be done carefully with a hand drill. The sight body is aluminum so it drills easy.
When done it should look like this-
View attachment 378546
