My mistake... Go to Effects.INI, and if someone here could explain how to make a new effect that would be great, but for now, just find the effect your explosion is, and
[Effect
nickname = gf_br_shield01 <-- Name of effect
effect_type = EFT_DAMAGE_SHIELD <-- the effect type, this is what you change
snd_effect = sh_br01 <-- the name of the sound that occurs
vis_effect = gf_br_shield01 <-- the visual effect, usually found in misc_ale.ini or explosion_ale.ini, or one of those other _ale.ini files
Have fun with the needler! ^^
Btw, in order to make a fun like the needler, you would simply make the explosion effect the same effect as the shot, and thus it would appear to "stick". Be warned though, once the lifetime expires, there is no second explosion.
FL:CE Mod Team Leader