I am considering this done for now - Updated with pics of the weathered system.
MAR-1a5 Modular Blaster Rifle System Manufactured by the Kaladium Arms Conglomerate.
The MAR - 1a5 MBRS comes as one package featuring three variants – Through the use of the patented Quick Change Barrel System, the MAR-1a5 is capable of being three blaster Rifles in one.
1. Assault Blaster Rifle – Short Barreled Version for Close Quarters
2. Medium Repeating Blaster Rifle – Direct Assault Operations
3. Long Range Interdiction Rifle – Enhanced Sniping
Some of the main features:
Range finder and TacScope system,
Interchangeable barrels with Variable discharge selector System – MaxBlast, Rapid, Solo, Auto
Helmet H.U.D. Integration System
Rapid Gas Refill and Quick Change Power Pack Port
Removable Stock
Enhanced Cooling Module
Now for the pictures:
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UPDATE: 6/23/10 - Pics of final weapon (for now) and weathered up.
Promo Poster

Barrels with the new compensators:

Short-Med Sight

Long Range Sight

These next shots are for showing weathering and some details
Rifle in the CQB configuration

Side view

Focus on the HUD Integration System

Upper view showing the Range Finder and some details

Power Pack detail

Other side showing the Enhanced Cooling Unit

CQB Barrel - added a new compensator onto the end - it is an aftermarket shift knob from Walmart

Assault Barrel - added a new compensator on the end - it is an aftermarket shift knob from Walmart

Another view of the Long Range Scope

-----------------------------------------------------------------------Pre-weathering info and pics------------
This is the main rifle with the accessories:
The Assault Blaster Barrel is attached already
The Medium Repeating Blaster Barrel is the first barrel closest to the Blaster
The Removable Stock is to the far right
Next is the Long Range Interdiction Barrel
Then the Short - Medium Range Quick Sight
Finally the Long Range Sight

Right Side

Left Side

Range Finder

This is the Helmet HUD Integration System

Here is a detail view of the right side rear which features the Blaster Gas Rapid Refill Connection and the Enhanced Cooling System

Three Barrel Assemblages

Assault Blaster Rifle Configuration with Short - Medium Quick Sight and Stock attached

Medium Repeating Blaster Rifle Configuration - note the Medium Range Enhanced Barrel System has been added

Finally this is the MAR-1a5 in its Long Range Interdiction Role - Note the Long Range Enhanced Barrel System and Long Range Sight are attached now

Close up of the Short Barrel

Close up of the Medium Barrel

...and finally the Long Range Barrel

Here in the next few days I will be posting the schematics for what each barrel is made of and where to find the parts along with more information on the weapon itself. I will also be working on weathering this out as well. So far it's taken me about a week of work to get it to this point and one thing I've learned...I HATE epoxy putty...also I will be making a couple of Star Warsy Scopes here in the next few days as well to see how they go with this and I've already thought of another detail I need to add along with I need to create a bi-pod system as the clamp is not the bipod system, lol...
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UPDATE 6/18/10 - Here are the schematics for the barrels to show you what they are made of:

I just noticed that I forgot to put on the last piece of the Medium size barrel which is a 1' x 3/4' slip on bushing...

All the pipe and pipe fitting pieces are from Lowe's
The Nozzle piece on the end of the Long Range Barrel jic it's hard to see is a Wine Pour Spout from Target OXO brand, and normally sells for $6...I thought it looked really cool and would make a great nozzle end.
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Please excuse some of the poor backgrounds as my product table was not built for items of this size, I will need to work on that sometime. All images are by me - KSImagery.
Hope you like it.
More to come and thanks for comments and feedback.
Ajax Kaal