Hello. I am a total gun novice in every sense of the word. I have held unloaded handguns and rifles, I know the difference between a revolver and a pistol as well as the terms semi-automatic and automatic. I also understand single action, where the hammer must be manually cocked before the weapon can be fired and must be done so with every shot. However I must admit, I am becoming a little bit confused with the concepts of double action, double action only, and striker fire. Also, I guess I dont fully understand the LEM option found on the USP or as an option on the P2000. Basically, I have decided that it is time to purchase a handgun that will serve as a cc weapon and a home defense weapon. I want a semi-auto pistol in 9mm with a decent amount of ammo (between 13-19 rounds) I went to a local gun shop yesterday and handled a few different weapons, the Ruger SR9c, Glock 19, Springfield xD. As a side note, I told the salesman in the shop that I have little knowledge about guns but that I wanted to purchase one for cc/home defense, and when showing and explaining the features of the 3 various weapons I could easily tell that the guy "helping" me was acting like a real smart ass in discussing the pros and cons of each, is this typical of the buying experience all gun novices encounter when making their first firearm purchase? I didn't buy anything, as I really went in with the intention of just learning and browsing, but I dont think I would return to that same shop as the attitude of the salesman was not appropriate. So, when I do finally make my purchase, I am wondering if purchasing a handgun off of the internet is a good route, as the prices seem much much lower. If anyone has any comments on the best place to actually purchase a firearm from that would be awesome. I digress, though. Of the Ruger SR9c, Glock 19, and Springfield xD, I really liked the feel of the Ruger but the Springfield had a much better trigger. According to the salesman the Ruger was set to 9lbs on the trigger and the Sringfield was at 8.5lbs. That half pound was a noticeable difference. When I asked if the Ruger could be adjusted or changed so that it was at 8.5lbs I was told that it was not possible on the Ruger. Does anyone know if this is true? Lastly, I really like the P2000 and the P2000sk. I was told by the same guy that the P2000 and the sk only come in in double action only, no striker fire option. Is this true? The term striker fire was new to me and is what the salesman used to describe the type of action found on the Springfield xD. So basically, whatever style/type of action found on the xD is what I am hoping the p2000 or sk have also, whatever it may be called. Thanks!