I just purchased a new 610-3. It has the hole in the front for the interchangable sight system but the current plain black sight is pinned so I have some questions. What would be involved with adding the parts to make the front sight interchangable? Looks like I would need to remove the pin install a spring and plunger then reinstall the pin. Is it that simple? Has anyone ever done this?? Are fiberoptic fronts readily available for this system?