View Full Version : Addax ZK GPU (Zombie Killer) Prototypes

02-27-2010, 12:55 PM
The Addax ZK GPU is something we have been developing for the past year.

The Addax ZK GPU is built around our ESS (Enhanced Short Stroke) Piston System.

The Enhanced part is basically that our design allows for more gas dwell timing, and this provides for a softer and smoother cycling action and minimizes carrier tilt.

Some of you might notice that the gas block looks very similar to the original Addax GPU Short Stroke Piston Uppers, but that is the only part that has any resemblance to our original Addax GPU.

This is an entirely new system incorporating many enhancements over the original GPU short stroke piston system we used to use, and this is an Addax Tactical design, and we will be manufacturing this new piston system, uppers and eventually complete rifles/carbines.

This system has 4 gas setting adjustments to allow the user to fine tune the piston system to their needs / requirements.

There is a one piece piston rod assembly, and a one piece bolt carrier using a standard mil-spec AR bolt.

Our new system is very simple, yet efficient in design and operation.

The pictures below are prototypes mounted on various lowers.

These are not the final production models, but these prototypes are 90% of the final design, so we are almost ready to finalize the overall design for production.

We want to get another 15,000-20,000 rounds of testing in before we move forward to production.

(Sorry, no pics of the internals just yet, since we are still tweaking the overall design).

Preliminary Specs of the ZK GPU's

Gas Piston System: Addax ESS Gas Piston System (Enhanced Short Stroke)

Bolt Carrier: One Piece Mil-Spec Bolt Carrier Group with Rear Pads (Mil-Spec, MP Tested Bolts)

Calibers: 5.56 Nato, 6.8 SpecII (or 6.8x43), 6x45 (future release), 7.62x39 (future release)

Barrel Lengths: 12.5", 14.5", 16", 18" (future release)

Gas System Length: Carbine, Mid-Length (future release)

Handguard/Rail: Magpul MOE (Standard), DD Omega 7" (Optional), Troy MRF or Drop In Rails (future release), ARMS rails (future release)

Flash Hider/Comps: Addax-Carlson ZK FLASH HIDER (Standard), Addax FSC-Bulldog Comp, Smith Vortex G6A2, Various PWS Comps, Surefire Comps

Upper Options: Addax Billet Upper Receiver (Future Release)

Charging Handle Options: Armadynamics Ambi, Vltor-BCM Gunfighter

Weight: Approx. 4.65 Pounds with the MOE handguard and bolt carrier group installed

ADDAX-ZK16-MOE-GPU PROTOTYPE (with the Addax-Carlson ZK Flash Hider)



ADDAX-ZK16-OMEGA-GPU PROTOTYPE (with Smith G6A2 Vortex Flash Hider)

ADDAX-ZK-SBR-GPU PROTOTYPE (Modified Wilson Combat Rail used for testing purposes only)

This model is currently being field tested by one of our consultants in North Carolina who retains a SBR cert...


02-27-2010, 1:53 PM
I like the SBR.

03-05-2010, 9:43 PM
How about some Glamor Shots of the NEW Addax Zombie Killer Prototypes... http://www.ar15.com/images/smilies/icon_smile_wink.gif

(These are working/functional prototypes we have been utilizing for testing), plus we have several currently out being field tested.

This is a new piston system and series of piston uppers we have been working on for the past year.

Our new uppers utilize our in house designed Addax ESS (Enhanced Short Stroke) Piston System.

We will be releasing the ZK series of uppers soon...





05-06-2010, 4:18 PM
We just had one unit that completed Cold Weather Testing in Alaska for the past few months, without any complications or issues running the system in negative temp conditions, with frost, ice, etc.

I will post some pics of the testing done up in Alaska very soon.

We have another prototype currently in Arizona for further field testing.

More info. to follow soon.


05-06-2010, 4:29 PM
Sweet! Very nice looking upper Chris :drool5: