Show up 15-20 minutes early, sometimes you have to wait for the right person to help you. When you get to the counter, just say "I have something to declare" in a polite fashion, and they will walk you through the process. Have all the paperwork in case they ask for it, but they shouldn't with so many people standing around- they're more concerned about anything that is a hazard to the flight than whether your firearms components are legal. They probably won't even open your gun cases, and typically will just swab the outside for explosives and send you (and your bags) on your way.
All that said, is a suppressor considered a firearm? You might not even need to declare it, although it's a good idea if there is any doubt.
"We must, indeed, all hang together, or assuredly we shall all hang separately." -Benjamin Franklin
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