(Second edition after revocation, due to dialogue changes to English orthography.)
UPDATE 28/11/16: Back into writing after months stopped, and realized for the level of violence in this fic, the tag should be mature.
In an alternate Equestria, with nowadays morals, the first firearms were created to aid the military... and crime unfortunately.
After the first flintlock pistols and muskets were created to advance the military technology, the mass production went out of hand and eventually, a majority of the weapons disappeared in a far away land called Crystal Empire.
Mane Shaker, bounty hunter wanted by the law, decided to accept the new contract and investigate what is happening on his homeland, in the company of his friend, the "cured" former psychopath Pinkamena Diane Pie.
Once there, things go from calm to intense in just a matter of days, where they get to make new friends who help them in their objective, and some help Mane discover more about himself, some things making him happy, and others to make him scared of himself.