I apologize now if this has been covered a dozen times here somewhere. I did some poking around and I don't see what I'm looking for. I have a Bushy A2 with the permanent handle that I purchased during the Clinton Ban. Is there an OK optics option without breaking the bank. Will I really need to swap the receiver for a flat top, or can I do this without? I'm hoping for a unit that I can do fairly close fighting. I am a civilian. This gun spends most of its time in the safe. I have it for home defense, and target shooting. Thoughts?