I just ordered a new 870 from J&G Sales here in Prescott for $282. This model comes with a 2 shot mag extension ( 6+1) for its 18' barrel and is all black plastic stocked. I am hoping it does not have any key safety as I was not told it did when i orderd it. My question is besides replacing the orange plastic magazine spring cap what else should be replaced to get 100% reliability? Seems REMINGTON is offering mag extensions after all.