I had the chance to buy a 500A for just a 100 bucks so I did. Got home and during disassembly I find that it doesnt have a SER. # after a search I found that it was made before 1968. My idea was to put a short barrel on it and have it parked, but does this gun have any collector value and would I ruin it. Also while breaking down I noticed that the internals are the same as my other 500A (made late 1990s) have they changed that little and where did the 500 B/C/ECT. come in? Go ahead gimme your ideas and thoughts I bought it as a project so I will not be offended.