the ways shown above are alll good and will work, the final decision or "how" is yours but bear in mind ,from a security standpoint ( and belief), guns have been handled, dropped, removed from the displays AND 'stolen' over the years, so unless they are "under glass" and /or SOMEONE stands 'guard' at and around the display for the entire its "shown" ( why not, you can always answer questions the public will ask or throw at you), I would at LEAST use (add) a nylon tie to help 'secure' the gun to the display...far too many folks do NOT read or understand "English" when ALL the signs say "Please do NOT handle, or Display Only....."