11. Class 2 SOT status requires a manufacturer FFL, either Type 7 or 10. Class 3 SOT status requires a dealer FFL, either Type 1, 2, or 9. Collectors of Curio and Relic (C&R) Firearms C&R firearms are defined in Title 27, Code of Federal Regulations, Part 478.11 as those "of special interest to collectors by reason of some quality other than is associated with firearms intended for sporting use or as offensive or defensive weapons." To be recognized by ATF as a C&R firearm, a firearm must fall into at least one of the following three categories: Firearms manufactured more than 50 years prior to the current date, not including replicas Firearms certified by the curator of a municipal, state, or federal museum that exhibits firearms as curios or relics of museum interest Any other firearms that derive a substantial part of their monetary value from the fact that they are novel, rare, bizarre, or because of their association with some historical figure, period, or event. Proof of qualification of a particular firearm under this category requires evidence of present value and evidence that like firearms are not available except as collector's items, or that the value of like firearms available in ordinary commercial channels is substantially less. C&R firearms include most manually operated and semi-automatic firearms used by a military force prior to . This includes most firearms used by the warring nations in World War I and World War II. However, the firearm must normally also be in its original configuration to retain the C&R designation. So, for example, an unaltered Mauser Karabiner 98k rifle used by the German Army in World War II is a C&R firearm – but the same rifle "sporterized" with new stock and finish is generally not considered a C&R firearm. There is an ambiguous point in how the license is currently administered, in that some firearms altered by the militaries that issued them have been confirmed by the ATF to retain C&R status, though whether this applies to all such conversions (the examples given by the ATF were the Spanish M1916 Guardia Civil, FR-7, and FR-8 Mausers) also remains ambiguous. However, as long as the receiver (the part of the firearm that is regulated by the ATF) is over 50 years old, the firearm qualifies as a Curio & Relic – ATF states explicitly that, in addition to newer firearms it