Ok Guys, a question has been wondering around my mind for a few years and I just now stumbled back upon it while browsing trim nailers. Why does it seem that every company has a 15, 16, and 18 Ga nailer? I get having 2 sizes, sometimes you want a bigger nail for more strength, sometimes a smaller to hide better or help eliminate splitting. But why the heck is it needed to have the 15 AND 16...is that 9 and 1/2 thousandths really enough difference to justify? It doesn't make sense to me why they'd design/manufacture both, and DEFINITELY doesn't make sense to me to want to purchase both