OVERVIEW

BS-7 is to be a long range rifle utilizing compressed air as propulsion.  A ceonceptualized this rifle soon after completing the GNS.  I want this model to be a long range, multi shot capability, practical weapon.  I have already done a box magazine design with the FAR.  I intend to use a cylinder magazine (think revolver) for this rifle.  Because of the small size of a cylinder and the lack of a need for reciprocation, the cylinder will be placed in the buttstock technically making this rifle a bullpup configuration.  Below is a sketch I did in October of 2005 of what I think  BS-7 might look like.

And here is a layout of rough cut parts.  I simulated the air tank with a container of carpet powder.

I`m kicking around the idea of making this rifle semi-automatic.  The cylinder will be 4-5 shots.  Hopefully, the size tank I intend to use will hold enough air for that many shots.  The cylinder will be detachable to allow for a pre loaded cylinder to me dropped in instead of reloading the installed one. 

With my access to rapid prototyping technology through my University, I hope to fabricate some complex components.  I have already manufactured the trigger valve. 

The automatic operation will bleed gases off the barrel to drive the operating rod to rotate the cylinder.  I had mentioned in the BS-3 article that I did not believe that there could be enough force from the pressures available to drive a gas operated system.  In that case, the bolt was very heavy and the seals created a lot of friction.  In the action for the BS-7 the operating rod should be fairly light and free to move.  Hopefully, there will be enough pressure available to drive this system. 

In the case that the autoloading system does not work, I am planning on a contingency plan.  Due to the nature of the gas operated system it will be very easy to convert he system to pump-action.  I am actually thing of making provision for both modes of operation (think SPAS-12).  The operator could fire the rifle in automatic mode or switch to pump-action mode.  

Below are a couple of CAD images.  The rifle is not even close to being completed in CAD.  I have drawn up both valves, the cylinder and its indexing track, the barrel, and a few receiver parts.  The operating rod and that portion of the action has not been designed yet. 

There is a long way to go on this rifle and I do not know how fast progress will be made.  I am anxious to get the rifle working and completed.  If it comes out as I imagine I think it will the sweetest one yet.  Time will tell. 

SPECIFICATIONS

Description.........Bullpup Tactical Rifle

Designation...........................BS-7

Release Date...........................TBD

Caliber......................Micro Stefans

Operation......Gas Operated Semi-automatic

Propulsion..................Compressed Air

Magazine.................Detachable Rotary

Mag Capacity.............................4

Overall Length.......................25 in

Barrel Length........................14 in

Max Rate of Fire..................~300 RPM

Max Range..............................N/A

Effective Range........................N/A

Accurate Range.........................N/A

Intended Use...............Primary, Sniper

• 1 1/4" SCH 40 PVC    (Receiver, Magazine)

• 1" 200 psi PVC    (Bolt, Receiver Cover, Stock)

• 1/2" PVC Couplers    (Barrel spacers, Shell Rim, etc)

• 1/2" PVC    (Barrel, Shells, etc)