I've been trying to find out myself. I have a 15/22 pistol I would like to get a 16" upper for. I have to contact them about a revolver. I will try to remember to ask about the upper
Short answer, no. If you looking to swap a 15-22 complete upper on to a regular AR15 don't bother. It doesn't fit.
However there are not many parts needed to complete an upper. Complete barrel assembly, Upper receiver, handguard and barrel nut. All parts needed are listed on: