Hamilton Models 7, 11,
15, 19, 23, 27, 027, 31, 35, 39, and 43 rifles are listed in Section III of the Curio and Relics List as "Weapons Removed From The NFA As Collector's Items and Classified as Curios Or Relics Under the GCA."
See page 35 of the Curio and Relics List at
Curio and Relics Listing
You're good to go.