I just recently got a P30S in 9mm and while I was disassembling I noticed two things. First, that the slide release does not come out of the frame like in my HK45 and USP40c, which is a featur I actually like and wonder why the same wasn't done with the HK45. The second thing and the main reason I am posting this is why does the P30 have a red recoil spring. I have read that is was to differentiate between other calibers. Really? Are they that easy to confuse? I can't manage to confuse my three different caliber recoil springs. Anyways, thank you for you responses in advance.