[brett7]

pawn Code:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if((newkeys==KEY_FIRE))

    {
       
            new Float:x,Float:y,Float:z,Float:x2,Float:y2,Float:az;
            GetPlayerPos(playerid,x,y,z);
            CreateObject(barrelid, x, y+1, z, 0, 0, 0);
       
    }
    return 1;
}

very basic but you get the idea