What model do you have. I an older NR83A2 with now adjuster welded a nut to the foot/shoe you depress to fire and installed a screw/bolt you can use to adjust depth. I used a bolt 1/4-20 with dead down as to limit damage to material your nailing in to (fence boards / siding). Before I used to lower the air pressure to the gun via the compressors regulator output. Hope this helps
I have a older Hitachi 3 1/2 full roundhead nailer and on my there is a button on the front below the head at the end of the nails that you push sideways and hold and slide the nail gun tip up or down. There should be grooves across the front of the tip.
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