 
 <translate> Q: Passage: Under the National Firearms Act (NFA), it is illegal for a private citizen to possess a sawed-off modern smokeless powder shotgun (a shotgun with a barrel length shorter than 18 inches ( 46 cm) or an overall length shorter than 26 inches (66 cm) ) (under U.S.C. Title II), without a tax-paid registration from the Bureau of Alcohol, Tobacco, Firearms and Explosives, requiring a background check and either a $200 or $5 tax for every transfer, depending upon the specific manufacturing circumstances of the particular sawed-off modern shotgun being transferred. Gun trusts have become an increasingly popular means of registering SBS' with the BATFE. Short-barreled muzzleloading blackpowder shotguns, in contrast, are not illegal by federal law and require no tax-stamped permit, although they may be illegal under state law. As with all NFA regulated firearms, a new tax stamp must be purchased before every transfer. Inter-state transfers must be facilitated through a Federal Firearms Licensee (FFL) while intrastate transfers may be between two persons.

Question: Based on this passage, what is the shortest legal length of a shotgun barrel? Let's give stream of consciousness first: <ibo> Q: Passage: N'okpuru iwu National Firearms Act (NFA), ọ bụ iwu na-akwadoghị ka onye nkịtị nwee egbe egbe ọgbara ọhụrụ na-enweghị anwụrụ ọkụ (ọgba egbe nwere ogologo ọkpọ dị mkpụmkpụ karịa 18 inch (cm 46) ma ọ bụ ogologo ogologo dị mkpụmkpụ karịa 26 inch (66 cm) ) (n'okpuru U.S.C. Isi nke Abụọ), na-enweghị ndebanye ụtụ isi na-akwụ ụgwọ site na Bureau of Alcohol, Tobacco, Firearms and Explosives, na-achọ nyocha ndabere na ma ọ bụ $ 200 ma ọ bụ $ 5 ụtụ maka mbufe ọ bụla, dabere na ọnọdụ nrụpụta nke egbe egbe ọgbara ọhụrụ a na-ebufe. Ngwá agha agha aghọwo ụzọ a na-ewu ewu nke ịdenye aha SBS 'na BATFE. N'aka nke ọzọ, egbe ojii na-agba agba na-agba agba na-agba ọsọ, n'ụzọ dị iche, abụghị iwu na-akwadoghị iwu gọọmentị etiti ma ọ dịghị achọ ka a na-enye ha ikike ụtụ isi, ọ bụ ezie na ha nwere ike ịbụ iwu na-akwadoghị n'okpuru iwu steeti. Dị ka ọ dị na egbe ọ bụla NFA na-achịkwa, a ghaghị ịzụta stampụ ụtụ isi ọhụrụ tupu nnyefe ọ bụla. A ga-eme ka mbufe n'etiti steeti dị mfe site na Federal Firearms Licensee (FFL) ebe mbufe n'etiti steeti nwere ike ịbụ n'etiti mmadụ abụọ.  Ajụjụ: Dabere n'ihe e kwuru n'amaokwu a, olee otú ogologo ogwe égbè na-adị n'iwu? Ka anyị buru ụzọ mee ka uche anyị dịrị n'ihe anyị na-eme: 