There should be a simple answer to your question, but politics keeps getting in the way. The safest course is to buy an Encore pistol or frame, then add rifle barrels later. One purchased as a rifle initially must stay a rifle. The last I checked, pistols could still be fitted with rifle barrels and stocks, but there was a time when the BATF said it was illegal to do so, a bureaucratic decision. If the 4473 you filled out when you bought yours said "rifle", better not fool around. Much cheaper to just buy another frame than hiring a lawyer.
