Gray triggers on Urban Tagger's Australian-based Elite Blasters are the surefire way to tell what kind of blaster you've got. Personally, I like the gray plastic trigger better. Using a gray trigger in a repainted blaster would look better than painting a trigger gray or black only to have the paint wear off.
So it looks like we've got a basic visual way to tell the difference between different strengths in blasters. Blue triggers on Dart Tag gear are better while Orange triggers on Elite gear denote the stronger performance. ...interesting!
Gotta love UT's attentio to detail!