Everything you ever wanted to know about the Yugo M64 / M70A Bolt Hold Open Feature

pinakar · Sep 8, 2015

Thought I'd post these here before they are lost forever on the other forum.....

The Basics.

You will need the following for this to work.

1. m64 - reciever
2. Shoulder Screw / Nut
3. Bolt Hold Open Lever
4. Retaining Rivet ( above trigger axis pin )
5. M64 Magazine, or Modified M70 magazine.

This BHO lever / feature is only for the YUGO m64. OR more Accurately called the M70A
It will not work in any other receiver.

You will have one of two receivers.

1. Re-Welded Original
2. ORF - Assault Weapons of Ohio

If you have a Re-Welded original, you will need to make sure the area in which the lever sits is clean and free of slag or other post welding issues.

If you have an ORF-AWO receiver the cutout area that the lever rides in may be a few thousands too narrow, Just take a little off the lever to compensate for this..

The Following photos should tell you everything you ever wanted to know about the Bolt Hold Open feature of the Yugo m70a/m64

Xygorak · Sep 8, 2015

Thank you for posting this valuable resource!

pinakar · Sep 8, 2015

Photos of 3x ORIGINAL Levers ( Only about 7 known to exist in the States.... )

Below are Copies made to fit the ORF / AWO Receivers.

Notice the offset made to the body of the lever.. This was necessary to fit the ORF / AWO receivers.

22many · Sep 8, 2015

Stickied!

Xygorak · Sep 18, 2015

too bad

Richard W. · Oct 16, 2015

thanks, man. super pictures.

pinakar · Mar 9, 2017

Ironrabbit said:
Excellent post! Someone needs to need to make a posting of this caliber on how the PSL bolt hold open device works. If there is one please let me know.

Thanks!! Lot of research went into that.. I don't think many care about it though, have not seen many builds that incorporate the BHO device.....

Richard W. · Mar 9, 2017

Yeah, so many new guys lately, but few seem to be interested in arcane AK features. Lots of static, very little signal.

I've got an M64 full-stock with the BHO. Been meaning to make a video of it in operation with the receiver cover removed.

Blank cartridges I think, so I can do it at my leisure in my backyard.

marshaul · Apr 11, 2018

AKBLUE said:
^^^ Yep., any way you can restore the pics?

pinakar said:
Working on it.....

Any chance we will still get the pics back?

AKBLUE · Jul 1, 2017

^^^ Yep., any way you can restore the pics?

Hueto · Apr 11, 2018

I don't remember exactly which pics were originally in the OP, but these are some that I've saved over the years. Hope it helps someone.

pinakar · Apr 11, 2018

Content RESTORED!!!!!! Now all you Russian lovers get over to the Russian section and get those photos back up!!!

ebp · Apr 25, 2018

Any chance you have one of these in a drawer somewhere?

AKFan1 · Jun 25, 2019

Are you still making these for sell or do have blue prints I can buy. I am currently doing a saw cut reweld M64/M72A and what to make this an original as it came from factory. Thanks how ever you can help

fredski · Feb 8, 2023

Great info. Thanks

vincefriel4759 · Nov 5, 2023

is there a chance you measured them? or did you just want to show off what you made.

ddskehan · Nov 7, 2023

I’d like to get one installed, anyone doing this mod?

ddskehan · Nov 7, 2023

I have a newer m70

Crilbus · Jun 30, 2025

Very interesting, I have a Atlantic M64 kit I was disappointed to find out that the levers are unobtanium and that it came super banged up.

KMAAA96 · Jul 1, 2025

Saving this page for future reference. Thanks, posts like this is what I love about forums like this.

Everything you ever wanted to know about the Yugo M64 / M70A Bolt Hold Open Feature

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