Loomie - Doesn't the gubmint provide you guys with suppressed equipment for field use? Or is this can for your personal use (e.g. deer hunting) when you return?
The "fuel filter" suppressors originated when a guy made a threaded adapter that allowed anyone to twist an actual fuel filter onto the end of their barrel. Surprisingly effective at noise suppression, but there's obviously a sighting and balance issue with that big blob hanging there. Anyway, in their attempt to reign in this McGuyver'd solution from circumnavigating the ATF Tax Stamp encumbrance, the ATF - in their infinite wisdom - assigned Tax Stamp status to the adapter. You can buy one online for $40, but it requires a Tax Stamp to legally own and use. No shit.
Others are making them out of in-line fuel filter parts:
American ingenuity, or idjuts?
Regardless (as noted above), thanks for what you do to protect us from enemies, foreign and domestic.