As part of the lightweight generation of STIHL chainsaws, the MS 171 features reduced-emission engine technology — an advantage for the user because it reduces fuel consumption while reducing exhaust emissions. This innovative chainsaw is just right for homeowners who need to cut firewood, fell small trees or do clean up. *A majority of STIHL gasoline-powered units sold in the United States are built in the United States from domestic and foreign parts and components.