Question: what is the difference between 15 and 16 gauge nails?
Answer: Like 15-gauge nailers, most 16-gauge guns shoot nails up to 2-1/2 in. long and are suitable for thick trim. The main advantage of a 16-gauge gun is that it's smaller and lighter. If you're shopping for a finish nailer, I'd recommend the larger 15-gauge gun, simply because the fatter nails provide more holding power.