PS and PS3 are brand-new to market last-year. Unless you've bought chain in that time, you probably picked up a PM variety, which is semi-chisel, not full. You could get yellow-label (non-safety) PM chain (.050 gauge) which was fantastic chain for 35-45cc saws but I think that has been disc. by Stihl. If you bought for your 192, .043 guage, then green label semi-chisel is all I have ever seen available from Stihl in .043.