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When I was new to cars and very young I Picked up a 1/2 air impact gun in a serious shop and pulled the trigger stupidly just because. It had a 1/2" Swivel on it, leaning over to the side, so of course it shot off the gun like a bullet and could have seriously fucked somebody up, including me.
Those air guns are not trifles. I've seen alot of 'shops' using them but I would never assemble my car using one, not directly anyways (use a torque wrench for the final setting)
That said, sometimes its a bolt somewhere you really really don't want to come loose, and its just too far to reach for traditional hand tools... The air impact separates the real mechanics getting a job done in 5 minutes vs 2 hours of busting your knuckles with some hand tool.
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