Mounting a weapon in static position

What i'm trying to do is mount a weapon on the player, I got that all good and done. But the problem is when the player moves his camera/view around the weapon also moves.

Example:
The player looks down, more of the gun is revealed, player looks up most of the gun is gone.

I need to make the weapon static in the players view, so when the weapon is mounted it will stay in that position within the players view no matter where he looks. Any ideas