Fake gun question

[silentpyramid]

Hi, there's a question i wanted to ask for a long time.
While playing the Ghost Head i found in the third scenario a gun near the corpse in the men's toilet - but it can't be used as weapon, and you can only hang it on the shelf in the room near the room with Yuu\Alyssa's father. As far as i know, this action doesn't affect ending or anything and you can get "A" ending even without finding this handgun... So, what's the point? What does this item do, or it's some strange joke of the developers? I looked for the info about this gun in the couple of walktroughs but didn't find anything - so i hope that somebody here could answer me.

[ObscureNightmares]

If I recall correctly, hanging up the gun unlocks the door in that room and allows you to get another card key. I don't think you can get the best endings without it.

[RetroScissorman]

Im not sure, but I think you put the fake gun on some rack and you get a real gun. I didnt need the fake gun to get the best ending. I think its just optional.

[silentpyramid]

Oh, maybe you're right - when i hanged the fake gun, there was already a submachine gun with me, maybe that's why i didn't got anything when i used the gun.
Regarding the keycards - you can easily get all three of it without using a gun.