80% Silencers, the Political Ramifications of Mass Ownership is a bit old but I found it very informative. Some of the more interesting takeaways (emphasis added) are:
Purchasing or legally making a firearms silencer is one of the most effective steps a Second Amendment supporter can take to undermine the National Firearms Act and incrementally restore Second Amendment rights. Second Amendment supporters are well on the way to removing the NFA through an unusual tool: Overwhelming compliance.
Once silencers become common enough so they do not draw immediate attention at the range or in the field, we have the ingredients for victory.
At that point, a law enforcement officer will not have reasonable suspicion to inspect a silencer and to demand information to prove the silencer is legal and registered. Such demands would violate the First and Fourth Amendments.
An important part of this structure is a practice I have seen on a number of Youtube videos. The manufacturer information and serial number of the silencer pictured is covered. The information is there; it is simply not available to casual inspection or to the public. Removal of the cover is a search, requiring probable cause or a warrant. Do not grant permission for law enforcement to remove the cover.
I have heard of numerous incidents where local law enforcement officers have contacted the ATF about mere possession of silencers, short-barreled rifles, or short-barreled shotguns, only to be told the ATF is not interested unless there is another crime involved.
This is anecdotal. It indicates enforcement of mere possession of silencers may not be a high priority for the ATF.