When you look on Rugers website at the particular models it shows under the picture of the gun - Rifle 1-B , or Rifle 1-V, or Rifle 1-A etc, etc. The B model is pretty much a #1 standard model. V is for the varminter model, A is for the light sporter, S is for the medium sporter, H is for the tropical model, and there is a couple of others.