Adding all semi autos that use a detachable magazine to the NFA registry. Or did I mis-read? It sounds like firearms older than 120 days from the bill do not have to be registered.
H.R.1263 - 116th Congress (2019-2020): National Firearms Amendments Act of 2019
Summary of H.R.1263 - 116th Congress (2019-2020): National Firearms Amendments Act of 2019
www.congress.gov