I've only just got the arrows with the grenade (?) tips and am not sure how to enable them. From what i can tell, they're automatically enabled...but they don't seem to explode on impact and seem to have the same damage as normal fire arrows.
I've recently gotten the flame arrows if that's what you're talking about? Double tap "up" on the d-pad. --- When you say Maine Black Bears, you've said it all! Choke - the official soft-drink of the UNH Wildcats
When you get the explosive arrows, tap up on the D-pad to cycle between regular, flame/napalm ad explosive arrows. --- Still the number one reason for the success of the Internet. http://www.fahtastic.com/YAN/Extras/Sigs/Sig3-BW.jpg