I recently purchased two tungsten guide rods... one for my G19 and the other for my G23... both are Gen 4. I noticed when I opened the box and took them out they were very similar in size. I know both Glocks are pretty much the same gun... except for the caliber of course. I then looked at the packing the guide rods came in and I noticed both had the same product number and sku. I thought that was strange since both had different item numbers from the website I ordered them from. I emailed the company and have not received a response as of yet. My question is... are they indeed the same guide rods? Does it matter which Glock I put them in? Are the SS and tungsten guide rods just a big hype and really not the real deal? I have not been to the range yet to try them because of this.