Type
I Disruptor (Phase Disruptor) 
Type IA Disruptor (with belt/sash
clip)
The
Type IA Disruptor was one of the "in between" models that never saw any
real active service. It was originally built and commissioned to
replace the Type I, but by the time it was introduced in 2270 the Type
II Disruptor had already been approved for manufacture and fleet
wide distribution.
Type
II Disruptor------------------------ 
Type
III Disruptor-------------------------- 
MkI
Disruptor Rifle
A variant of the Type
III, the Type IIIA, would include mountings for a rifle stock, creating
the first known "Disruptor Rifle". The stock not only provided an
extra power pack reserve but also included an amplifier matrix that would
double the range and firepower of a Type IIIA Disruptor pistol. The Disruptor
Rifle, though mass produced and preferred by officers on the Birds Of Prey
of the Empire, would be phased out by the dawn of the 24th Century in favor
of the "Death Sting" Heavy Disruptor Pistol and the Type VI.
Old legends die hard though, for mercenaries and freedom fighters
still are seen carrying surplus MkI Disruptor Rifles as recently as 2375.
Type
IV Disruptor
Several prototypes
were built, but the Type IV would never see a military contract.
An instability in the power system design of the Type IV Disruptor led
to frequent overloads, and by the time the source of the problem was discovered,
the Type V "Death Sting" and Type VI Disruptor were being introduced
into the fleet.
Type
V Disruptor "Death Sting" 
Originally
to be designated the Type IIA, it was later decided to go ahead and dub
it the Type V. The Type V Disruptor or "Death Sting" as the
Imperial Marines would come to call it was on the outside almost identical
to the Type II. This was due to the fact that when the Type II was
recalled from service, a large number of them were still collecting dust
in munitions dumps all over Q'onos. Rather than sell them , the surplus
Type II's were shipped back to the factories and refitted
with new power packs and more heat resistant barrels. The "Death
Sting" would serve as the sidearm for the Imperial Marines til around 2297.
Type
VI Disruptor ---------------------------
The Type VI Disruptor began being
issued in the early 2290's. It would prove to be the best energy
weapon to ever be produced by the Empire and with little modifications
or upgrades it is still in fleetwide use as of 2376. A smaller yet
more powerful energizer pack gave it a higher total shot capacity,
more destructive firepower, and enabled the designer to give the weapon
a sleeker profile. The latter of these allowed for a better sighting
system, making it the preferred weapon for any Klingon sharpshooter.
Type VII Disruptor
The Type VII Disruptor
began full scale production in the mid to late 2360's. It has an
energizer pack with twice the capabilities of the Type VI, and a heavy
duty amplifier array in the emitter section(hence its great size).
The Type VII despite its improvements clearly sacrificed accuracy for firepower,
which is why it is now mainly in service with the Imperial Marines, while
the Type VI remains popular with Naval Officers.
