Um, OK, I went over the kids in the safe, counted noses, and remined myself what I had done. The count is actually - if you count just the last 12 months - 7, not 4.
In addition to the other I mentioned, I picked up a rifle last fall, and a neat old JC Higgins shotgun at a garage sale last August. Then there is another rifle I traded a pistol for last fall - does that count?
On the other hand if you average out the last 9 years since I started buying, it's about 2 per year on average.