I have owned several 500's over the years and all of them functioned perfectly under all conditions. The quality may have improved over the years, but the ones I owned back in the Stone Age reminded me of the AK47 from my USMC days. That rifle was made of old beer cans, or so it seemed, lots of stamped parts and felt a bit flimsy in your hands. But it never failed---never. Our M16's were solidly built, machined parts and all, and they failed constantly. Lots of Marines took AK47's from NVA casualties and used them until the politicians in DC found out and since the politicians were in bed with Colt and Armalite, that practice stopped in a hurry. The 500 is similar to the AK, seems a bit flimsy and machine tolerances [at least back then] are not the best, but it never fails.
Go for it, and good hunting.