The SIG320 is the only striker-fired pistol in existence where the firing pin is fully retracted when the pistol is loaded with the slide cycled. All others require some manipulation of the trigger to fully cock the firing pin.
The fallacy of the 320 is this fully cocked firing pin allows a full power strike on the primer if it somehow comes jarred loose. No need to pull the trigger, apparently, to get a full power strike. Hence, it seems to happen when jarred in holsters, etc.
This is the basis for the arguments that the 320/M17/M18 are unsafe.
Saying a Glock mimics the 320 when you pull the trigger to the wall is a disingenuous argument, at best. The firing pin on a Glock is fully retracted by manipulation of the trigger AFTER you engage the trigger safety tab. Try to get a Glock to fire if you load a primed case (no bullet and no powder) and pull the trigger back from the sides without engaging the trigger safety. Just ain't happening.
Put a primed case in a Glock and if you're not manipulating the trigger (put it in a trigger guarded holster), you'll never get the primed case to go off. Throw it off a building, run it over, smack it with a baseball bat. Video the results, post them here.
It ain't going off. Period.
