moderators capture high pressure cool air and restrict the high pressure release into lower pressure air reducing thepressure shock caused.
silencers on the other hand are restricted by the g'mnt and require a $200 tax stamp , but operate on a different principle. silencers cool hot gasses to a temperature close enough to existing air temp so that the hot~cool 'thunder effect' is reduced.
the main concern is that the letter of the law is that a device capable of reducing the report of a firearm by 1dB for one shot requiresthe tax stamp. most moderators are going to do that , so they must be attached to the airgun in such a way so thatit will be destroyed by removal from the airgunso it cannot ever be used on a firearm as it was built.
building a moderator that would befire destroyed without reducing the report if used on a firearm is one solution.
the other is get the tax stamp and have a class 2 federal firearms manufacturer build the device for you , otherwise it is also possible to be charged with manufacturing a class 1 destructive device without the proper licensing.
purpose built for air seems to me tobe the route to take . . . :o
it'd be nice to just put the law facts out for general knowledge , and would require no schematics of an actual device. i understand that it is a 'grey area' subject and any way to alleviatethat would be useful in my book. :)
the sumatra is definatelya real powerhouse , butcertainly quitenose heavy. the DAQ is the cure , but they're in very limited supply . . . :0
drop me an email and we can get together and shoot some of'em 8)