That's a problem with your technique. If you hold it down and keep the trigger depressed its going to multiple fire and jam. I used to do that with a Paslode when I was a rookie. I have done it with my HF, but usually when I have it in an awkward position.
The HF is so close to the Porter Cable I was considering buying their trigger kit (to avoid double fires) and seeing if it would fit.
First rule of all pneumatic nailers. Hold body parts further than the distance of the nail. I've got Sencos otherwise and the nails will travel sideways now and then because of the grain. I certainly don't think its the guns fault.
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