Hey Earl, First off, thank you for your service...To answer your question as best as I can, here I go. The Jet funnel is a flared mag well add-on that is intended for competitive shooters who need to slam a mag in fast during reloading between stations. You can either have it or not, it will make no difference in the operation.
I would also suggest you look for a model that has a decocker. Variant 1 (also known as V1) has a decocker and safety. In a defense situation your fine motor skills evaporate and you are running soley on training and muscle memory. A decocker will still let you shoot, but the first pull will be approx 12 lbs which I would prefer especially if you are awoken from a deep sleep and need to defend yourself.
As for the clear/white mags, I have no experience. All I have are OEM steel mags with the extended floorplates.
Hope this helps!