Dear CgCookie,
Could you please recommend a free replacement for the grenade audio?
From IVan.
http://soundbible.com/ is a good place to start, that's usually where I find some decent audio clips for free. You could also try Youtube although that usually requires trying to get the audio from a video clip that you download.
Thank you for suggesting the sources, but I have already checked them and could not find anything good. Could you please suggest something more specific.