I can't tell whether or not it's the nails I use or the gun it self. But every so often it will shoot two nails at once and usually jams after that. Happens a couple times a house. Gets pretty old fast.smeagol said:nice post. we use max paper collated for everything but lvls as well. We have hitachi nr90s for that. They do not feel much heavier but are deafening in comparison. the loudest is the b&C eagle 22160 shooting 6 inchers.