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H&K G11K2 as CO2-powered GBB


marvk

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Hey guys,
 
now that my Asahi based PGM Ultima Ratio Intervention has reached a stage where it does work but getting it to perform as wished for will take some fiddling and a lot of thinking, it is time to start a new project!
 
The next thing I will try to build is a as close as possible (with my skills and resources) replica of the famous H&K G11 in the K2 configuration. I have been collecting pictures for quite a while and watched the available footage of the gun at youtube and so on. A few weeks ago I have even been to the national library to have a look at the book: "Die G11 Story - Die Entwicklungsgeschichte einer High-Tech Waffe" which basically describes the development history of the rifle over more than two decades. It was quite interesting to read but did not really provide information on the parts I will be replicating. It mainly focusses on the design of the mechanics inside rather than the outside appearance of the rifle. As this is going to be an airsoft gun, the looks are more important ;) At least it did confirm that ABS plastics were used for the housing.
 
So I concluded some measurements from pictures via reference lengths and made some drawings of the "handguard" section of the rifle and started cutting my 3mm ABS sheets. To do so I build a kind of table the securely fit on my milling machine. The cut out pieces were then glued together. As far as the quality of surface and rounding of edges etc. goes, there is still work to do but for the first try I am pretty satisfied with the results.
 
As for the internals: I will get to this point later on. At the moment I am not able to work on my machines as the semester is going to start tomorrow. But I will do some 3D modelling of housing and internals over the upcoming days and weeks which I will then present to you here.
 
For now that's it, now let the pictures speak!
 
Cheers
 
marv
 

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daaaammn project suggestions board so hot right now  B)

 

g11 was a very cool concept - I wonder what could be done with it now rather then in the 70s.

 

might be getting ahead of myself but what mags do you intend to use? will it have a 3rnd burst?

 

 

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@Skarclaw

 

Mags will be purpose-built for this one, internally probably a mid-cap configuration.

 

Concerning the 3 round burst: I will try to implement one, have some patents and related documents of the H&K 3rnd burst trigger group. Replicating this has top priority. But in case it does not work out I will go with the simpler AR-style 3 rnd burst mechanism.

 

ATM I am working on 3D modeling the housing, will take some time though. Hopefully will be able to get the handguard section done over the weekend.

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Update with some pics of the 3D models of the front section and the rear section of the G11. Additionally the Madbull 12gr CO²-capsule holder and pressure adjuster has been modelled. This one will be the power source for the gbb action.

 

The middle section will hopefully be done by the end of the week.  The model will be used to determine the space available inside it for the action parts which will be modelled accordingly afterwards.

 

You may notice that not all details of the gun are fully reproduced at this time. As I am using it to get some info about the available space inside and how to build the hull with 3mm ABS sheets I am focused on these two points not a 100% accurate model.

 

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I was able to develop my 3D model as far as necessary for the next two steps. These are: determining how to build the remaining parts of the shell easily and efficiently from my 3mm thick ABS sheets while sticking to the dimensions of the real thing (still all scaled from pictures, so more or less accurate) and also to define the space available inside for the GBB mechanism, the power source and all the other dependent components.

 

The following picture shows the the complete model as a whole and a wire frame version as well as the wire frame version of the hollow space inside.

 

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From the third model I created a drawing with  several front, side and top views in 1:1 , 1:1,5 and 1:2 scale respectively. This one will be printed on a DIN A1 (ca. 590 mm x 840mm) sheet of paper. I will use it to design and engineer all the mechanical parts from the trigger and power source to the magazine holder/catch and barrel/ hop up.

 

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I dunno, RC. Google Sketchup is 'high-tech' in the same way that a digital calculator is 'high-tech'; hardly anyone that uses it could explain how it works in detail, but it's sufficiently user-friendly that most figure it out rapidly enough and the cost of admission is so low almost everyone can access it. If you design digitally and print out life-size templates to cut out manually you could achieve the same effect.

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Sure, until I reach a point when I really wished I had a 3-axis mill but still have to do it manually taking upwards of 10x the time and effort. But yeah, maybe switching to digital diagrams should be the minimum of changes for me in the near future. I just find it so hard to learn when Skyrim is just a click away.

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  • 4 months later...

Gents,

 

long time, no update! was busy with my last semester but now have some time before starting with my master thesis.

 

I did no additional work on the outside hull of the G11 but modelled the guts of the gun with Sketchup.

 

I took most of my inspiration from the escort / sun project GBB system and the design pattern filed by H&K for their 3-round burst in 1973.

 

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What I have come up with is the following:

 

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I ordered the aluminium and brass needed today and hopefully will have it by the end of the week. I hope the get most of it done before starting with my thesis in October,we will see if this plan works out. I will post pics as soon as I get going in the workshop.

 

Cheers

 

marv

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Trigger mechanism, hammer and round counter will be made from 7075 aluminum. Other parts from 7075 are the pink part around the barrel and the connecting blocks.

All the parts in contact with co2 are made from MS 58 / MS 63 brass, except for the blue block.

 

Axles will also be made of MS 58 and the side plates from Al Mg 3

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  • 2 weeks later...

I dug out my plans for an AEG G11k2 but now I feel incredibly inadequate.

Same here... I would made it totally different way (positive mold from wood/plastic, negative from special silicon/plaster, the gun itself would be fiberglass laminate, working with V3 box in modded G36 grip, full/semi/safe mechanical, full auto with burst wizard, it would use Mp40 mags, sadly they're too wide so just one on the top). But I won't have ever time for that too...

 

Fantastic work indeed.

 

What for the scope internals? What about putting RS G36 scope in it (that was originally my idea)?

http://egun.de/market/item.php?id=5057641

Cheapo as hell...

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I was thinking about the g36 RS scope too. But unfortunately most of the ones you get very cheap have some condensed water drops in them/ on the lens. That is at least what I have read in some article descriptions.

 

I have seen some interesting stuff on YouTube related to DIY night vision with ir capable miniature cameras, ir LEDs and small displays. That is a possibility I'm looking into atm. What I want it too look like is the Hensoldt Orion 80 II night vision scope.

 

But at first the mechanical parts have to be made which already proves to be difficult. I will post some pics in two weeks or so, I will be on holiday the next week and can just really start working on it in September.

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  • 3 weeks later...

So, here it goes! The first pictures from last weeks productive outcome:

 

It took quite some force to cut the big 1/2" BSP thread for the Madbull CO2 regulator:

 

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King Arms M4 magazine valve and Madbull CO2 regulator fitted:

 

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And the "gasport" of the valve-assembly. As you can see, the metal of the magazine valve is pretty soft.

 

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continuing with the plates holding all the fiddly bits:

 

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axles and blocks installed:

 

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sanding an pre-polishing the big one:

 

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endcap on front and back of the big one:

 

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preparing to drill and tap holes to hold the endcaps in place:

 

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slotting and milling the big one:

 

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cutting the taper on the barrel shroud:

 

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I did not think I would ever use this one again, after buying it for the Asahi/PGM project. But here it is again the 12x265 mm drill:

 

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more or less what it looks like at the moment:

 

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I'm looking forward to your comments and / or questions on the project!

 

that is it for now, won't be able to do something on it for another week or so. I'll keep you posted as soon as I continue to work on it.

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