A suppressor uses a Form 4 transfer, so that's nine months if your dealer has the can in stock. If not, you might have to wait three more months for the Form 3 to clear, allowing the manufacturer or distributor to transfer the can to your dealer.
To register a short barreled rifle, you'll file a Form 1 and wait nine months.
The ATF isn't making a distinction in this chart between processing times for paper forms vs. the newer e-form system. What's a little bit interesting is that the word from manufacturers I spoke with at SHOT 2014 was that e-filed Form 4s were coming back in under 4 months. I've always thought that something too good to be true is just that, so I wonder if the guys I spoke with were confusing Form 4s with the Form 3s they normally file to get cans to their dealers and distributors. That would line up with the current wait time of 3 months for a Form 3.
Another missing distinction is the wait time for trusts. It should be no shock, but I guess this is intentional. I had a long conversation with one of ATF's lawyers a couple of years ago and that person was very explicit and surprisingly candid in telling me that the ATF saw trusts as loopholes and they were looking for ways to get rid of them.
Update: Let's hope I'm wrong and the e-form system is really making a difference. Reader Matt seems to think this the case and says, "I have two Form 1 tax stamps that were filed via eforms in October and came back approved nearly 3 months to the day. I think the chart is for paper filed forms."
