First you should not use any framing gun that is not shouting a round head nail. Its called "code". Framing code is 3" X.131 Round Head everywhere in the U.S.A.[sence 1948]and roof rafters are 3 1/2 x .131 round head.
br /the "MAX SN890RH" has the same insides as the SN890ch/34. It will not double fire has a built in filter and has alot of power.It has a trigger lock so you don't shoot your self or your fellow worker and on both the SN890RH and SN890CH/34 they have a anti jam door . the door is used more in the SN890CH do to the generic nails that people buy that can have the WRONG angle. You need to buy 34 degree nails if you don't want jams.
br /MAX also makes some of the Paslode Air tools for them. If you are useing wood that is LVL then you will need to move up to the new 400 PSI guns that MAX makes.
br /The MAX line is the best nail gun line i've seen in my 36 years at the bench.
br /I have been fixing all power tool lines for 36 years in the New England area.

does not sink nails or keep up with a paslode. tricky loading and fortunetly it has a jam door bacause it jams once a day. My next gun might be senco's framepro or a paslode.