Be careful. I'm not saying anyone is right or wrong, and things could differ from area to area, but my shop (owned by a State Trooper), told me to buy it as a pistol frame, put the serial number of the frame on my pistol permit, then the caliber of barrel as well. He said that you can change the pistol into anything (mine's a muzzleoading rifle now), but not vice versa. I took his word for it. It is now on my permit.
I will say that I asked several gun dealers and got several different answers. It would pay to find out on an individual basis. I wouldn't want any law abiding gun owner to get into trouble.
I do love my Encore, though!