Fake gun at gun show

So i went to this gun show today in melbourne and in front of the auditorium (just like every other gun show) there was a table stand with a big sign that says "Win an AR-15" for a rafle, and on the sign is hanging an AR-15 (which basically just looks to me like a JG M4 S-system. So i go up to buy some tickets for it, maybe i will win the gun, and i glance back up at the gun, and chuckle and ask the guy "is that the gun you're raffling off?" and he sorta stutters and hesitates and says "uh, well umm, yyee-no, not that exact one" and i smile and say "good answer" and he asks why and i simply say "well because for one, thats not an AR-15, and two, its not a real gun, its an airsoft gun" and he just looks at me with surprise and says "in the 6 months we've done raffles like this, no one has ever noticed that its not a real gun"

The motor screws on the handle grip gave it away =P

Yeah I saw the booth out front didnt walk up to it though way too many people out front plus I was there to grab a red dot sight, laser and fill out some paperwork for a suppressor for my AR and a new pistol I have on order. That place was a little to packed Im used to gun shows being in huge expo centers where you can actually take more than a two second look at a gun.