I like the premise so far, and the simple set up is a plus to me, though the dialogue is written like a script and needs some descriptors or actions to break it up a bit. I would also suggest that you find yourself a proof reader, as there are some simple mistakes in spelling and such that could be improved. (You could try looking in the Fallout Equestria group, or the Fallout Equestria Related Fics group, in which submitting this to would also be a good start to boost feedback!) This story has got potential, and with this, a good foundation. Keep putting out chapters because I'm interested in seeing where it goes!

Well it looks good but it is way too fast

If the intent is to name him after the firearm component, it should be spelled "Firing Pin".

The reason this seems so short is because it is simply the prolog; also my proof reader is in a training command in the Navy and his off time is scarce what with working on his very own FOE fic. Don't worry the chapters will be long and have alot more substance to them; after all he did just kicked out into the wasteland didn't he lol.