AK full auto conversion - DIAS/LL

DESCRIPTION: Last Friday there has been a topic at AR15.com regarding an AK DIAS (drop in auto sear).
After reading the initial topic my conclusion was that there is no such thing (the matter registered or not is beyond this consideration). A search at the web resulted in the usual rumors...
All the full auto conversions I've seen require drilling, welding, cutting parts of the guide rails etc. - what is of course not the meaning of "drop in".

Since in principle every semi auto selfloader can be modified to shoot full auto I decided to build my own device.
In the meantime some people told me they would consider it being a Lightning Link (LL) as it is known for AR15-rifles.
Since I was just dealing with the trigger assembly due to my AKM rate reducer video all the necessary stuff was at hand.

http://img155.imageshack.us/img155/8356/img3013.jpg
http://img405.imageshack.us/img405/3016/img3030d.jpg
http://img405.imageshack.us/img405/3126/img3028q.jpg

Don't know if this is new, maybe somebody did this before - I simply wanted to see how it can be done and if it works as intended.
The task was to use the original parts to catch the hammer avoiding safety issues due to possibly improperly homemade parts. Should work no matter if full or semi auto bolt carrier. Should be possible to make with a minimum of technical equipment and as always as few and simple parts as possible.

In the following the trigger is pulled unless stated otherwise. DIAS/LL rides on the trigger pin.
If the hammer has passed the front hook the left ear (of the hammer) pushes against the lever arm of the DIAS/LL spring thus creating a rearward push at the DIAS/LL.

So you could say the hammer generates the spring pressure which is pushing away the disconnector. If the hammer passes the front hook of the trigger on its forward move the auto-sear immediately turns forward into its starting position again.

If the front end of the DIAS/LL is released by the bolt carrier the rear end of the DIAS/LL turns downwards and it's angled part contacts the tail of the disconnector and pushes it down and away from the hammer thus disengaging the disconnector from the hammer. The hammer now turns forward and hits the firing pin.
The DIAS/LL and thus the hammer will be released if the bolt carrier is about 1mm before its front position (3mm at the original auto-sear).

Requires a full-auto disconnector. I've seen some altered "half tail" FA disconnectors where they chopped the rear half (red line) of the tail (which is originally having contact with the safety lever) - these will work too. True semi-auto sears (no tail at all - green line) won't.
http://img17.imageshack.us/img17/1275/img2870tail.jpg

As is this makes it FA only.
There are (at least) two ways (using the same basic design) to make it a real select fire rifle.
First to use a slotted hole for the DIAS/LL and link it together with the safety lever.
Lever in the middle pos. as described.
Lever in the downward pos. (semi-auto) will pull back the DIAS/LL so that the spring will disengage with the hammer and the DIAS/LL with the disconnector at the same time. So you have your regular semi-auto trigger setting.
Second you link one arm of the spring (DIAS/LL) with the safety lever. In a way that in the semi-auto pos. it would pull away the spring from the hammer without changing the forward (rest) pos. of the DIAS/LL.
A proposal by shawnmlynch: The safety lever in the semi pos. blocks the DIAS/LL - best of all.
In all cases you would need a third (middle) pos. for the safety lever.
There is either a pin (milled receivers) or L-shaped part (sheet metal receivers) that limits the downward travel of the safety lever.
There exist semi-auto versions where the semi-auto pos. is down like at the FA version and some where the travel of the safety is limited to about the middle pos. For the described select fire mods the first one is better.

No blueprint or further specifications available.

Since this subject gets broached in the comments from time to time:
You could file the disconnector down to a degree where the hammer is barely kept by the disconnector, so that the impact of the bolt carrier hitting the receiver at the end of its forward move is sufficient to release the hammer - very unsafe and dangerous method!!!
The hammer might get released when bolt is closed or earlier due to vibrations of the gun.
Or might not release the hammer at the impact of the bolt carrier but when you start to release the trigger!
And you loose semi-auto option.
The auto-sear required for safe controlled full-auto modus.
You can see the operation of the FA-sear in the DESCRIPTION to my AKM rate reducer video.

For academic use only - observe your laws!
In Germany full auto conversion parts are free for sale. You can even own a semi auto gun and the corresponding full auto parts at the same time. But you are not allowed to install them. Important is what you actually do.

Category:

Science & Technology

Tags:

• AK47
• AKM
• DIAS
• drop
• in
• auto
• sear
• full
• conversion
• LL
• Lightning
• Link

[Aguilar8788]

This seems like a bad idea for a youtube video...

[troubleshooterBerlin]

@Aguilar8788

Well, considering some of the comments you might be correct...

But haven't seen anybody duplicating this - there are some little sticking points I didn't refer to and for that very same reason I didn't publish the second method I tried, which is pretty simple to do.

[mgmanmike]

@troubleshooterBerlin I have seen Identical DIAS/LLs for the ak in the U.S.

[troubleshooterBerlin]

@mgmanmike

Where? There is a single licensed manufacturer in the U.S. who got the specs from me. I asked him to make a video of a live fire test once he got it done - never seen any. So I believed he didn't make it work or didn't have time to do...

He got it for free - I never intended to make money with this item - so don't worry about finking on sb.

[elitearbor]

To all those looking for a "how-to" on this - LOOK AT THE VIDEO INFORMATION. It is ALL laid out right there. Between the video, description, and photographs anyone can figure it out. Please, though, DO NOT break the law. It's not worth 10 years in jail or the six-digit fine.

@troubleshooterBerlin

Danke schön. :)

[EquipaPatriot]

WHERE DO I GET THIS DIAS?

[teardownthegates]

This is for law abiding citizens who like to have the Knowledge, and have the parts to do it legally, WITHOUT ACTUALLY DOING ANYTHING TO THEIR WEAPON!!! Being prepared for any situation is better than not being prepared. Criminals will be criminals with or without this information.

[471signu]

@drjoe2323 Where did you see it?

[471signu]

@mgmanmike I'M INTERESTED.

[mgmanmike]

Conversion manuals for sale for many firearms! IM me if interested!