Issue: 2" nails not (never) set below surface. Answer: Bought a 2 gallon bucket of finish nails (various lengths) at a ga rage sale ($5) some years back. Said nails got mixed in with my new "Porte r Cable" brand nails. Look almost identical. On closer examination I find the the 'no brand' nails are slightly fatter than the "Porter Cable". Did not 'mike' the diameters, but, comparing clips, 12 "porter cable" nails ta ke up the same amount of space as 9 of the 'no brand' nails. No wonder the gun would not fire about one out of four times. Had to open the gun and m anually push the nails ahead for the next shot. Learned my lesson. Brand name fasteners only from now on.