Will it fit?

Will this launcher
http://www.airsoftgi.com/product_info.php?cPath=139_128&products_id=988
fit on the bottom of my KWA M4, along with a vertical handgrip?

I can't tell exactly how big this launcher is from the picture, so I can't tell if I should get the smaller one or not.

you could get a regular m203 with http://www.airsoftpost.com/product_info.php?products_id=29087

Friend of mine has one of those Mad Bull launchers on his M4. It's the regular version so it takes up the whole RIS rail, no way to fit a vertical grip with it on though unless you maybe move it up a little. Mad Bull does make make a smaller version but even then i'm not sure how well a vertical grip would fit behind it.

buy a standard M203 and they make a verticle grip that attachs to the bottom of the launcher. Its pricey but worth ir if your that desperate.
http://www.airsoftpost.com/product_info.php?cPath=25_115&products_id=31073