Tried all the alternate controls. No luck. How do I fire the grenade launcher on the oicw (land warrior)

there are a buch of weapon special button you can use to navigate the menu.  i cant say exactly wich does what off hand but in the level were you get it they teach you how to use it.

First you scope.  Then you special weapon 3 (i think), moves the menu cursor.  Select 5.56 and hit special weapon 4 to change to 20mm.

Now, when you pull the trigger, it will shoot 20mm shells.

With 20mm selected, cusor down to the next option (LASE), aim at something a little away, and select that option.  Now, you'll have a red dot in the scope, and the distance to the target.  Aim at the dot, and fire, and your shell should hit its mark.

You can also manually adjust the distance, and turn on the scope nitevision with that menu.

It only shoots them when you're looking through the scope too for some innane reason. I sure hope the real weapon doen't work that way.

This is not the gun for grenades on the fly.. THE only reason I use this weapon is when i need a fast shooting sniper rifle...  The grenade launching is a joke.

Yeah the grenades are a joke, at least I know what the red dot is for now. They should tell us how we can bind quick keys to simplify and speed up the process.
I.E.
bind G +switch weapon mode (556/Grenade)
bind L +activated laser range finder

you get the idea.

You have to use these weapon special keys. These are [ and ].

Go into sniper mode and [ is change or switch between things and ] is sort of activate. Press ] on the weapon thing at the top(still in sniper mode here) to change it to grenedes, then press ] again on lase. Now you can shoot grenedes, but only in sniper mode. I don't have a clue what range+ and range- do though!!

what a pain in the a** to do all that stuff, and then carry it out after all the scrolling ya gotta do. lol  Now try that in multi. Like we are gonna stay behind that wall long enough for you to go thru that charade??? hahahaha