I have wanted an MP5 clone for a long time. I don’t know a great deal about them, however, for me, the Z5p seems to fit the bill quite nicely. A problem is they are no where to be found. The POF k seems to be a great secondary option. The one thing lacking appears to be a rail since I am looking to add an optic down the road. What are my options less having to weld one on it and deal with partial refinishing? Thanks in advance.