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15/16 ga for less nail holes to fill and more stability. 18 ga for where nails are needed but thinner material would split/break from larger gauge.

We used the Paslode brand of gas-powered finish nail guns back in the day. edr730 is right; they did break down more than we liked. One thing we did not like about them other than the break-downs was...

Gas cartridge or battery? Framing nails or finish nails?
I like them but they need more looking after than a regular nail gun.