TexasCHLforum.com

This has nothing to do with handcuffs, but is just a note that the NRA Personal Protection courses recommend, if you have to restrain a threat at gunpoint, to have them lie face down, legs splayed, and arms outstretched with the palms facing up.

If you've had any training in a grappling or ground-fighting martial art, you'll agree this is just about the optimum position if you're on the offense. Moreover, in this position the threat has the least possible opportunity to access another weapon without your awareness. Which is key: in any likely confrontation, you will not have patted the guy down or wanded him; he may have dropped the gun or knife you saw initially, but that doesn't mean he doesn't have another weapon on his person. Even handcuffs don't completely mitigate this risk. Remember Officer Rodney Johnson's death last year?