Encoreman - you might be able to do it youself if you are pretty handy. It is often necessary to drill out the old red fiber op rod - requires a .040 drill bit, which is not a common hardware store item. You want to cut the new green rod long enough to let about 3/32" stick out the front - with the end your eye sees a little below flush. The end your eye sees has to be cut very square and even. Then you heat the part sticking out the front with a Bic lighter until it forms a little molten ball. Finish by putting a dab of the kind of superglue used to gluerear view mirrors on the inside of you car windshield. Done right, it is very durable.

The rear peep basically just screws on - but sometimes you can't get it high enough for heavy conical bullets; and, in that case, you have to make a little spacer block raise the sight up about .100". Machined out of aluminum, the block looks like it came on the rifle. Don't remove theaperature insert and make a ghost ring out of it. The way it comes from Williams is about the right size aperature.

Good luck. Roskoe