On Mar 15, 4:16*pm, bryan wrote:
Can I use an air-actuated framing nailer gun to nail parallel 2x4s
together?

I have a home business, and one of the tasks is to screw 2x4s together
to make one thick post. I spread glue on the 3.5" wide faces, then
clamp them together before fastening.

Instead of driving deck screws for fastening, I am curious if I can
use a pneumatic framing nailer.

Would I split the wood?

I think you would be fine. Nails won't have the holding power of the
screws but this may not matter depending on your application. Out of
curiosity why don't you just use a 4x4?