It's a 9mm no rail. On the end of the box it says "E29-9-TSS" and also it has "SIGARMS,229,9,T,SLITE" What does all this stand for? S/N AL458xx. Any idea when it was made? I bought it for a carry gun, which works well. Has night sites and shoots like a dream. I see all these P229's in different models but can't tell which one I have. This must sound pretty stupid but I need to ask.