I'm playing devils advocate. Why would a shop that does SSE go along with this. You would be taking away potential profits from them. I did see one situation where a customer brought in his own kit that he developed and performed and SSE. However, what if the store says no.
Don't get me wrong I'm all for this. There are some stores that will only do SSE on guns that are in their inventory. Just recently a local store said, it would do an CZ 75 for me. They would only do the CZ 75 they had in stock. I wanted an SP-01.