Why is it ridiculous? A safety is a part of all guns, even weird ones.
1967 Dean Martin movie - The Ambushers
I have seen bra holsters for pocket guns, but never a bra gun.
Movies are FANTASY!
In real life, there would be no reason whatsoever for a bra gun???
No way to aim it accurately.
Guns create heat when fired. Wouldn’t want that near body parts!
1965, The Tenth Victim, featuring Ursula Andress sporting a bra gun:
U[del]rsula A[/del]ndress
The assailants in Austin Powers who sported the nipple-mounted firearms were robots (“fembots”), not real women, so presumably the guns were in fact implanted in the breast and not merely a feature of the bra itself.
I have a friend who recently underwent double breast reconstruction, I should ask her if that was an available option.
Or for hunting free-roaming boobs (kind of like that Woody Allen movie, but not giant-sized).
So, it’d be like a pair of snub-nosed 38s, then?
The attitude I think I’m seeing in this entire thread, mostly, is that nobody really thinks it’s a possible or practical thing; hence no serious comments about it; so the whole topic becomes open season for jokes and snark. It seems there’s a consensus that there really isn’t any “practical conversation” to be had here.
ETA: Okay, maybe there’s a practical conversation to be had about “real life female carry issues”, but this thread isn’t that.
Moderating
You’re welcome to start another thread if you have some serious questions. A thread that started out based on something seen in Austin Powers movie was never going to be very serious.
Colibri
General Questions Moderator
Not to mention recoil!
I don’t think recoil would be such an issue if you designed the gun properly. Just build a rigid frame around the breast so that recoil is directed back straight to the ribcage and not the breast tissue itself, with sufficient padding that you don’t bruise the ribs.
You could also get a little extra barrel length if the guns started near the armpit and ended near the nipple. It wouldn’t be straight out in front of you, but bra-guns are hardly going to need much accuracy or range. Two guns aimed to cross three to six feet in front of you would probably do the job.
Still not a very practical idea… 
I was told or read that some IDF special forces are/were equipped with some kind of central(-ish) chest mounted small arms (heh) for room-to-room missions.
No idea if this is true, let alone–never having been soldier–if this is outlandish.
Does Maxwell Smart know about this?
The old guns-in-the-brassier trick. That’s the second time I’ve fallen for it this month!
Over- and under-wires.
Here’s Katy Perry’s take on the concept.
Perry ≠ Gaga