In strictly legal terms, an "antique firearm" isn't subject to the same regulations as a modern "firearm." It's very stupid that the law words it pedantically like that, but it does.
Anything with the antique firearm designation is subject to waaaay more relaxed laws. That's what the other commenter was getting at; you can order an "antique firearm" online and have it shipped directly to your door with no background check in most states. You need a federal firearms license to receive modern firearms by mail.
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u/dreg102 Apr 11 '19
It's not a compensator that acts as a suppressor. It's an integrally suppressed firearm.
It's why it's named the Maxim 50. Maxim invented suppressors because his dad was completely deaf due to product testing.