View Full Version : Original factory jig for welding cocking tube

01-10-2011, 08:16 PM
Thought I would share... I was browsing the German E-gun site and came across something interesting. Aside from selling brand new un marked HK G3 receivers, the auction has some very cool pictures of the factory jig used to weld the cocking tube in perfect alignment. I think the piece on the bottom is the mandrel that goes in the tube.

Here is a translated URL for the page (link may be dead now) %3fid%3d3107348%26PHPSESSID%3da0315f6606316920d6c8 f440d5f9a491


01-10-2011, 08:33 PM
Cool find

01-10-2011, 10:17 PM
The tool you see on the bottom is for seating and clock aligning the trunnion. Notice how the fitting on the end of the rod is the exact opposite of the cuts on the top of a trunnion. The tool with the T handle is the same diameter as the trunnion face, the two tools fit together right there where they meet as they are laying, if you look closely you can see the shoulder where they fit together. Also notice how the raw receivers shown are egg shaped.... closer together from top to bottom in the area where the trunnions fit, the trunnions do not easily slide in those like the ones we build.....I've seen that on original Hk replacement receivers. Been a long time since I've seen one. I'll bet Perro has a picture in his manuals that show that alignment jig in use. I no longer have access to any of those armorers manuals. If I had known then, what I know now,,,,,I would have spent a lot of hours at a copy machine....

01-10-2011, 10:28 PM
At 515 euros,,,,that's a demonic $666 US dollars......and 84 cents.... for a danged old egg shaped receiver....:icon_biggrin:

01-10-2011, 10:31 PM
thanks for sharing that....I wondered how HK got the trunion clocked correctly and the cocking tube welded on in direct line with the rec. at the factory

01-10-2011, 10:46 PM
IIRC the back end of that rod has a twin handle, one which holds the rod and the other that is used to tighten it in. Wish they had a picture of the whole thing, I would like to build one instead of using a piece of allthread, and a bunch of washers.:eek: Thirty years of cranial interruption and interference, makes me wish I had paid better attention back then.

01-10-2011, 11:14 PM
I will bet Holescreek or one of you can knock that off or a reasonable facsimile. :icon_biggrin:

01-14-2011, 10:53 AM
that's what i was getting at about alignment about a year ago. I'm finally in the stage where I can make my 3 firearms..

01-14-2011, 06:50 PM
Great looking tool,thanks for sharing it with us.

01-15-2011, 06:53 AM
hmmm, I have a friend or two in Germany...

02-15-2011, 04:55 PM
any idea what the setup costs for this could be?

02-15-2011, 06:40 PM
just goes to show you, no matter what the job or the skill the right tools make all the difference.