We'll be making some adjustments to the rifle ranges in the near future. We're currently testing the Rail Rifle and Combat Rifle internally (the two missing archetypes). Within the assault rifle class the four weapon types will break down as follows:

Assault Rifle (Hybrid - Plasma) - short range
Combat Rifle (Projectile - Autocannon) - short-mid range
Scrambler Rifle (Laser - Pulse) - mid range
Rail Rifle (Hybrid - Railgun) - long range

Keep in mind though that long range for an assault rifle is not equivalent to long range for a sniper rifle, so while they will adhere to existing category definitions don't expect massive differences in the distances between these weapons
A lot of the original assault rifle variants (Breach, Burst, Tactical) were created to fill the gaps these newer weapons will fill and so mightGÇÖve felt out of place (not to mention we just plain made mistakes with some of them). The scrambler rifleGÇÖs optimal range will be increased and weGÇÖll be releasing an iteration of the Tactical Assault Rifle with a smaller clip and much wider hip-fire spread making it less effective in CQC. If that change alone does not prove enough we will walk the damage of the TAR down slowly. No big, sweeping changes this time.

I wish you all could. We currently don't have A SiSi like server for DUST. Wish we did. Would love the feedback earlier.