Muley is correct in that it means Curio and Relic. These guns are not excempt from ffl requirements. If a gun is more than 50 years old or is on the C & R list published by BATF (also available on their web site) it qualifies as a C & R. This simply means that the holder of a C & R license can purchase these guns without going through a background check. They can also receive these gun from an interstate shipment and can by from a resident of a different that in which the buyer resides. Any person who does not have a C & R Collector license must go through the same procedure when C & R gun as when he buys any other.