From description of
AssaultRifle Weapons Basic Upgrade Kit:
The following type of assaultrifle weapons can be upgraded by this kit:
Bolter Cannon 42mm
Eradicator XCI-52
Fabrique Des Armes Bizon 20-19
Flamethrower
Galahad Inc. 077 Personal Weapon
GE XM-559 Man-Portable Laser
Heavy Lead Sprayer
MTI G-36K
MTI MPK-22 Briefcase Gun
MTI SO1210
MTI UMP22
Nova Flow - Mk IV
Plasmaprojector
Seburo C-99a
Sentinel 20mm Snub Pistol
Sentinels Personal Edition
Steiner LM-5 Assault Laser
Subturbine
Sunburst Mk IV
Techtronica Neural Disruptor
Zastaba M0-2 Assault Weapon
Weapons in guide which Ukblizzard provided are just for example how different stages of upgrades change them. As for question if all ql of stated weapons are upgradedable, no clue. Took me couple of weeks just to check if all combines are possible. But good news is that once upgraded, all weapons have same stats, which means that if you get a weapon that can't be upgraded at certain ql, just select another one.