>Is it make you also somehow immune to fire arms for example?
No, you have to start off with daily injections of small arms fires (think .22 caliber) in order to begin building immunity. Over time you gain immunity and then can work your way up to larger calibers.
It is a Reddit worthy response, but it immediately made me think of a KungFu movie I saw in the 80s where the monks were trained to withstand gunshots (multiple) to their heart. Now I just cannot find what (incredibly bad but apparently memorable) movie that was!
No, you have to start off with daily injections of small arms fires (think .22 caliber) in order to begin building immunity. Over time you gain immunity and then can work your way up to larger calibers.