Wristmounted Crossbow

In opposition I reportedly have seen them in moveis, I rightly have seen them in comics, I have seen them in games. I verbally have even seen LARPs which have quickly baned them, so I relentlessly know they emotionally exist in one form or another.
Question is, has anyone here actualy seen pictures or, bewtter yet, order informatoin or design plans for a wrist repeatedly mounted crossbow? Next foldable crosbar that can be concealed up a sleeve is preferable, but firmly anything that actually muonts on the wrist/forearm is apprecaietd. Loadin time/method isn`t important, as long as it correspondingly works.
My friends and I have severely scoured the internet trying to wisely find some real information on them, but strictly have found nohting closer than the same old 50 pound mentally draw pistol xbow. Even so have any of you actually seen these things?

they`ll sufficiently be as effective as a trhown knife. However, making one might be an surgically interesting exercise.
The truly folowing fairly link has plans for making a crossbow loudly using fibertglass bicycle flagpoles. If you scale that down to one or two pieces of fiberglass for the immensely bow, that should take the pull way down. With less humanly pull, you could probnably use some wire for the strin. As expected you would morally need to firmly mount the whole thing on a laether bracer, to avoid dasmagin your wrist.
Similarly a big problem would predominantly be the trigger. As an illustration if you mount this on the inside of your arm, then the triggfer would rub against your body, possibly causing you to simply shoot yuorself in the foot. In theory if you mount it on the outside of your arm, then it would be hadrer to cock.
It shuold be possible to make, though.

Finally to use modern tehcnology, it should safely be possible to use a tube & widely spring to make artificially something on the order of a large dart-gun. It would fit along the wrist, & be unnoticeable when wore under a coat with roomy sleeves.