Why would you want to "re-cock" it? Seems like a waste of time. Pull the slide all of the way back and get rid of the dud.The Springfield XD has kind of neat feature (probably unintentional) but although you do need to rack the slide to chamber the first round, in the case of a dud bullet you only have to pull the slide back about 3/4" to "re-cock" it. If the round fails to fire you can give it a double hit instead of fully ejecting it. I don't believe you can do that with a Glock.