Best hardi board gun ever

There are alot of hardi board guns on the market and they are all very expensive.I installed hardi for years and have owned many of them.The best gun I ever had was a Bostich coil nailer for plywood.It has a high capacity magazine and all you have to do to get the nails to shoot flush without damaging the hardiboard is to put a rubber cap on the nail head.Go to a drug store and get the round caps that go on the bottom of a cruch drill a hole in the center of cap and cut out a notch so the safety slide will move freely.apply a few drops of crazy glue and you got yourself one mean hardi gun for a third of the cost.