That's still not an argument. "Every thinking person recognizes" provides no evidence for the claim. There are many thinking people who don't recognize it as a "natural right", so the burden is on those who do to prove the claim. I would want to know first, what God are you talking about? Secondly, where is the source or evidence for this God giving gun possession as a right? (Note, we've gone from "guns" to "self defence", and from discussing mass shootings and homicide to self defence, which appears to evade the actual problem under discussion).