It "supposedly" takes place but having been in that industry for many years I can tell you it is a farce and actually rarely takes place.
With Pyramydair, one of the chief repetitive complaints is that previously returned or restocked rifles are being shipped as "new" - or at least the condition of the new rifles gives that impression. This deal is likely a ploy to try and encourage buyers to authorize prior use of the guns so that Pyramyd will have a valid excuse for selling restocks as new. If you choose the 10 for 10 deal, rest assured you are likely authorizing them to send you a previously owned (for a short time) returned or restocked gun. That's my suspicion anyway.