Two selectable trigger modes top the list of what we like about this roof nailer. With just a turn of a knob, you can increase your production and cut your work time using the bump-fire method, covering a huge area of roof in no time at all. When precision takes precedence over speed, just turn the knob back to sequential fire. If, for some reason, you want only the single fire, Porter-Cable will send you the mechanism for free. Other features on this nailer are what youd expect from Porter-Cable. The shingle guide adjusts quickly and easily and locks down securely for absolute consistency; the depth-of-drive adjustment is quick and easy to use, and it has detents at every quarter-turn of the knob. Non-skid pads on the housing help keep the tool from sliding down a steep pitch, and the rubber grip is smooth and comfortable. Though we didnt experience any misfires or jams, youd need a slender rod to nudge the driver blade up and a pair of needle nose pliers to pull out a jammed nail.