Your good ol' quickscope --->[attachment=1:20vdlnq8]Quickscope.vkm[/attachment:20vdlnq8]
The same as above, but silent in killcams and game winners --->[attachment=0:20vdlnq8]Silent Quickscope.vkm[/attachment:20vdlnq8]
Note: I've only used throwing knives with the silent quickscope macro, I'm pretty sure most attachments will work with it.
The silent quickscope can also be used with most weapons. Not sure about rockets.
A suggestion if you don't want it do be an auto quickscope: Delete LT, and RT lines, and move the rest backwards, but relative to each other. Then assign the macro to the right trigger, and assign one of the Tac buttons to enable it on and off. When pulling the trigger once, it will hold down right bumper, and switch it back to the weapon very quickly.
I wouldn't expect automatic weapons to work well with this. Shotguns, pistols, snipers, and FAL MIGHT work.
I have yet to test this with various weapons. Will update.