Hello, I have a quick question that I couldn't seem to find the answer to when I was using the search function. If I send my gen 2 glock 17 to glock with some small cracks in the frame near the magwell, is it possible for them to change the frame to a gen 3? Or would they have to keep it a gen 2 frame? The cracks are not much of an issue, but it would be nice to be able to get the rails that come with the gen 3's if possible. Also i've read that guns shipped for warranty reimbursement are OK to be shipped by civilians, is this true or do i need an FFL? Thanks!