Got a pleasant surprise this afternoon. The gun shop that I bought the 845 at called to let me know they were doing inventory & found the original box for my gun...it has most of the original items inside that include an unused PC mag, the (extra) target spring & a guide rod (minus the plunger/spring). It also has the owners manual, warranty cards & a PC services price list sheet...
I have Had the hammer "bounce back" on other S&W autos. It doesn't seem to have any affect on regular function.