Normally machine-gunning down an opponent in a fit of rage is strictly frowned upon even in the 'anything-goes' format of Lucha Libre. There are however exceptions to any rule and this would be an outline for when it is permissible for a Luchadore to use fully automatic firearms in combat:
1 - Aztec Mummies: Virtually immune to even the most elaborate of flying kicks and strangle holds, the Aztec Mummy is a juggernaut of undead fury. In these cases the Thompson Machine Gun can become a Luchadores best friend. Grenades and flamethrowers however remain the preferred method for disposing of these bandaged ghouls.
2 - Vampire Luchadores: It is a well known fact amongst vampires that drinking the blood of a masked luchadore is the equivalent of mainlining a dose of plutonium grade steroids cut with the copious amounts of crystal meth... giving even the feeblest of revenants the strength of ten gorillas (or two Luchadore Gorillas). This is why there are so many vampire luchadores down in Parts Unknown searching for a quick way to 'Juice Up'. While crosses, holy water, sunlight and cilantro are the most effective means of disposing these creatures of the night... machine gunning them in the face at point blank range however will not only give the Wrestling Vampire Hunter a small edge in the ring but also just generally make him or her feel better.
3 - Giant Floating Brains with Tentacles: These extradiemesional beasts occasionally worm their way into our reality through rifts in the space/time continuum for purposes of tourism and planetary domination. Remember to aim for the frontal lobes and avoid having your firearms barrel get tangled in their weaving hentai tentacles.
4 - The Jaguar Men of Oaxaca: Long believed to be extinct since the 'Great Jaguar Men Purge of '59', there are still a few of these stout giants who bear the heads of Jaguars terrorizing the populace with their love of human flesh and Mexican speed metal. Most are employed by various Drug Lords as body guards. Though these creatures can be bested in hand to hand combat by a skilled luchadore... it is believed that machine gunning them down saves all parties concerned a considerable amount of time.
5 - Avatars of Ah Puch (the Mayan God of Death): When a twelve foot tall skeleton bearing the head of an owl comes lumbering into the ring to throw down you better believe it's okay to bring a gun to a mask fight!
6 - Robots: Often used by Mad Scientists (as well as Mad Scientologists) to rob banks, destroy cities, teach the fools to laugh at them and just genearlly to "...impress the Babe's". The trick here is to use the machine gun as a decoy tactic before attempting to load Windows Vista into their Operating System. Once Vista is loaded even the most fearsome robot will be rendered as helpless.
I believe there are a few other exceptions but those are the Big Six so to speak. I hope this guideline will be of use to any aspiring luchadores or fans of masked men machine gunning down things indiscriminately.
( The image in Context )