In late 3052 engineers at the DSC Armory began a project 
to design an advanced assault battlemech to serve in 
front line forces across the Inner Sphere.  It was 
dubbed the 'Osiris Project' and was to become the new 
money-maker for the manufacturer.  Design difficulties and 
procurement of advanced technology from the Gray Death 
Memory Core lead the Armory to abandon the Osiris 
Project after three years of development with no success.

With the openning of the large Armory plant on Keystone, 
the project was revived.  Along with assistance from 
Earthwerks, engineers began a redesign of the original 
Osiris using updated technology.  The first battlemech of 
the series rolled off the assembly lines of the Keystone 
plant on August 2nd of 3061.

Capabilities:
Based on similar design principles as the Awesome and 
Stalker, the Osiris is built to last.  The DSC Armory 
envisioned a new heavy line mech in the assault class to 
provide great deal of firepower on the battlefield while able 
to withstand counter-attacks.  Cost was a definite issue for 
the small manufacturer though, and several concessions 
were made from the original design.

Originally the Osiris was intended to be a faster machine, 
capable of matching the Battlemaster for speed.  In order 
to get the desired combat performance, an extra-light 
engine was required.  Due to difficulty of obtaining a 
reliable supply of extra-light engines, engineers chose to 
instead mount a cheaper GM 270 plant.  While the Osiris 
does maintain a respectable speed of about 50 kph, this is 
a marked decrease from the original 64 kph that was 
intended.

In order to keep the Osiris operational on the battlefield, 
the designers provided the Osiris with sixteen and a half 
tons of DSC Standard armor.  This shows that the Osiris 
has an extra bit of staying power over other large line 
mechs.  Of course, there are battlemechs with heavier 
armor, but the Osiris also protects both mech and 
mechwarrior with a Cellular Ammunition Storage Equipment 
system for the volatile autocannon rounds.  So should the 
armor be penetrated and the autocannon ammunition 
explode, the battlemech would be salvageable, and could 
possibly even continue to fight.

The weapons package is the biggest selling point on the 
beast.  A Zeus Slingshot gauss rifle embedded in the right 
arm forms the main source of firepower on the Osiris.  
Capable of dealing extreme damage to targets at long 
range, the gauss rifle fulfills its role as primary armament 
exceedingly well.  Backing up the gauss rifle is a new 
development from Imperator Automatic Weaponry.  The 
Imperator Automatic Ultra-10 autocannon is capable of 
delivering a hail of shells out to moderate ranges.  Given 
the high rate of fire the Ultra-10 can achieve, designers 
have provided three tons of ammunition, enough to last 
over two minutes of firing at the maximum rate.  Rounding 
out the weapons package are a pair of arm mounted 
RAMTech 1200 heavy laser and a pair of RAMTech 800P 
medium pulse lasers.  The older model RAMTech 1200 
has been problematic throughout developement, and 
several buyers have suggested replacing them with 
Blazefire Sweetshot extended-range lasers, but designers 
felt comfortable with the older weapons system which 
would keep cost down.  With the additional lasers, the 
Osiris finds itself most comfortable at medium ranges.

Deployment:
Currently the Free Worlds League seems to be buying the 
vast majority of Osiris battlemechs.  Several have been 
sold to the Lyran Alliance as well, and orders are expected 
to increase once battlefield performance is fully 
demonstrated.  There have been delays in deployments 
though, as several divisions have reported actuator 
problems with the hip and upper leg assemblies.  
Designers are looking into the issue to determine the 
source of the problems and whether a recall is warranted.

Variants:
OSR-11B - On the suggestion of some mechwarriors with 
the Free Worlds Legionnaires, the Keystone plant has 
begun producing a variation on the standard model OSR.  
The OSR-11B replaces the Imperator autocannon with a 
Kali Yama Weapon Industries class 10 LB-X cannon.  To 
account for the loss in firepower by removing the rapid 
firing Imperator cannon, the medium pulse lasers have 
been removed and a third RAMTech 1200 large laser has 
been mounted in the center torso.  Too accomodate the 
increased heat of the added laser, an additional 
double-strength heat sink is carried in the left arm.

OSR-11BX - A simple field refit of the 11B model, the Free 
Worlds Legionnaires have found that the RAMTech laser 
mounted in the center torso is easily replaced by a Victory 
Nickel Alloy extended range model large laser imported 
from the Draconis Combine.