Hi, There should be a power adjustment on the top of the driving head. Make adjustments there, and the penetration should improve.
--W/D--
Sorry---no adjustment, only 2 assembly screws
I see in looking at your manual it says two different things: one says it will shoot 1-1/4" nails, and another place says 1" nails. Your model may not be able to shoot the longer nails. Here's a link to your manual so you can see what I'm seeing. Try the shorter 1" nails and see if it will drive them. If it will, the issue is probably with the nails, if it won't, the issue is with the gun. Sorry about the earlier answer. I thought your gun and mine were the same, until I went and looked.
Here's your manual:http://www.arrowfastener.com/product/et2...
Best regards, --W/D--
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