Pneumatic Medium Crown Gun set up for the normal other than "slam fire" mode. Since it was new, it has always double and at times tripple fired given a PSI of about 110 to 120 PSI. Have to be really careful in pressing the trigger for it not to do so. Often the extra staples either don't go in all the way or jam the tool. What's the perspective causes to this and solutions? Say a Senco medium crown staple gun - thats a decent brand one would think. Note other guns don't seem to have problems with this pressure but it's the only one of this type that's new and or of this size given the others are firing narrow crown or finish nails and brads. System pressure is also good given a huge tank & lots of 1" tubing between the tank and minimum of 3/8" hose. Granted there is long runs but at theoretical volume sized tubing and little to no other use of the air while using the tool.