I assume for framing, I'd want a round headed nail gun? Do the framing nail guns have a mechanism that requires they be pressed against the wood to fire? I assume they do.
Thanks!
I couldn't tell you about the benefits or applications of round head vs clipped head, other than to say that the framing nailer I used was a clipped-head variety. Fun and fast, but like firing a real gun, you learn to respect its power and potential danger!
Most of these nailguns operate the same way, with a safety switch that must have pressure applied to it, and then the trigger. The safest way to operate the gun is in that exact order -- you position the gun where you want the nail to be inserted, press the gun down firmly on the surface to activate the safety, then pull the trigger to shoot the nail. Framing nailers work the same way.
However, most also have a "bump fire" mode which works the exact opposite way: you hold down the trigger, and then you repeatedly move the nailgun to where you want the nails to shoot, and every time the pressure switch is triggered, the gun shoots a nail. It's great for rapidly shooting a bunch of nails down an edge, every 12 inches for example. Just hold down the trigger and bounce the nailer down the line, bump-bump-bump.
The problem is, as you may discover when you use this mode, sometimes you accidentally double-bounce the gun off the surface (instead of "bump" it's more of a "bu-bump") and that will cause two nails to get shoot into almost exactly the same spot. Where will the second nail go? That's hard to predict; if you're lucky it will sink in parallel to the first one, but it might also bounce right off the first one and go flying, or it might crack the wood and start following the grain, bending along the way. You'll sometimes see that happen when you fire a nail and see that it exits the wood in a direction you didn't expect.
There is a similar risk if you are trying to shoot a nail, say, through a hole in a metal plate, and you miss the hole and send the nail right into the plate. It could bounce off and go flying.
The bigger framing nails are shot at higher power and can do much more damage if the errant nail ends up flying into your hand or worse, back up into your face. Also, the bigger nailers are heavier, increasing the risk that as your arm gets tired, you start positioning it less accurately.
That's why I would caution not to use bump-fire mode (at least at first); slow down, take your time, position the nailer exactly where you want it, take a moment to make sure your hands are clear, then fire away.