Looks cool. The textures are nice. Also keep in mind the grenade will be held in a hand for 95% of the time it's on screen, which will help hide the silhouette if you wanted to knock off a few polys.
[ QUOTE ] Also keep in mind the grenade will be held in a hand for 95% of the time it's on screen, which will help hide the silhouette if you wanted to knock off a few polys. [/ QUOTE ]With that in mind, you could probably let the normal map do all of those grippy bits.