Friend of mine owns two gun shops - they go in there all the time unannounced.
Yes, of course... Licensed gun dealers have to put up with that. I do not.
What many don’t realize is a “silenced” weapon also requires sub-sonic ammo to be “silent”. Most Americans out there who would purchase suppressors if they become legal will still run conventional ammo and not sub-sonic down those bores.
I have two ATF Form 4 (suppressor) & a Form 1 (SBR) stamps and have never been asked for verification at the 3 different ranges I use them on...