You'd be retarded if you did, because there isn't a specific application for them. You do a standard ATF Form-4.
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A .22LR with a suppressor is still 112 decibels. According to Purdue, it compares to... Steel mill, auto horn at 1 meter. Turbo-fan aircraft at takeoff power at 200 ft (118 dB). Riveting machine (110 dB); live rock music (108 - 114 dB).
A suppressed M1911, .45 is 130 decibels, which according to Purdue is the same as Military jet aircraft take-off from aircraft carrier with afterburner at 50 ft (130 dB).
In response to Gelston's comments that it will be ovious a firearm discharged even with a suppressor:
Quite fankly you fucks owe me an apology. First of all I addressed concerns around the use of silencers early in this discussion, I know what a silencer is, I'm not scared of the name (FFS I was an 0311) and you're all butthurt because I taught you something you didn't know.
Where did I say that all these people are assassinating police officers? I'll help you out. I never did. We do have Dorner's example. When he shot those cops they were baffled why neighbors never reported gunshots. The reason they didn't? Take a guess...Silencers.
Make these things ubiquitous will mean they'll be used more and more often in crime. Does anyone not agree with that? If so, please explain.