This is a weird title, because what is a perfect shuffle? The word shuffle does not necessary imply a rifle shuffle, and does perfect mean "it mixes the cards well" or is it meaning "cards go down left-right-left-right". It the later, then "perfect" shuffles don't randomize at all, as evidenced by the fact that 8 faros return the deck to order consistently.

I can do this when in shape, but like most mortal sleight-of-hand practitioners, only with in-hand faros. Actual table faros, what most people are thinking of with a rifle, are the domain of very very few, and even fewer can get that to a point of consistency. In hand faros are not impossible given fresh cards and enough practice.