I purchased a set of the Benjamin Sheridan scope mounts for the Blue streak, they have a 3/8 dovetail. I mounted them to the rifle, and made them snug, then I mounted the scope ring's and tightened them down, now the scope mounts are loose on the rifle. These mounts in my opinion are useless. I went to Baker Air guns and purchased their 1 piece mount, and give it a try. The other sights mentioned could be modified so that when you tighten the the scope it would not compress the space between the dovetails, thus releasing the clamping force of the scope mount clamp screws.