I would put the pic here but, I am not "hot linking" to any photo on any web site with cia.gov in the web URL address plus a copyright notice.
See The Actual PIC Of It - Click Here
"The Wild Wild West"
One of James West’s most popular gadgets is the secret sleeve device. As performed by Robert Conrad, West first used this mechanism in the series’ pilot episode, "The Night of the Inferno." Strapped to his right forearm under his jacket, the device would cause a derringer to slide forward into West’s hand when he triggered it to do so. A standard part of West’s spy gear, the gadget is used regularly throughout the series. Most of the time, it is the derringer that is attached; at other times there is a tube of acid, or some other life-saving attachment.
This is the original prop sleeve device that Conrad used while playing Jim West in this popular TV series. While it doesn’t have the derringer attached, its spring-ejection capability remains in excellent working order.
WHAT IF...An engineer could come up with a WORKING device that actually would present a firearm DERRINGER or Maybe a NAA or a little Walther TPH .22 (from up your sleeve) right into the palm of your hand. Cool!
First:...would it be legal for concealed carry?
Second: Would it have any practical application "in real life?"
Third: Would you buy one?