OK I think I just figured something out! I think you can use a FAL FCG for this, or something very similar. It would just need to be "thin" enough to fit in the empty space on the side.
Here is my idea:
Lay the hammer and disconnector on their RH side, LH side facing up.
Modify both the disconnector and the trigger to add a 45 degree slope on their adjoining lip. The trigger may need a slightly taller back-end, which may need to be farther to the side.
The action is identical to a normal FAL action. The difference it that both the disconnector and hammer axis is vertical, and the sloped face of the trigger pushes upward, forcing the disconnector to move left-right on its vertical axis.
The trigger frame could contain the ends of the axis pins, the tops of which could be set into holes in that blocking shim.
Modify the shape of the hammer to fit.
For the spur that prevents out-of-battery misfires, a block could be placed on the carrier in that area in-between the top of the recoil spring and the bottom of the bolt. There is a threaded hole there. That hole could be the mount point for the spur. The spur would be oriented like the AK's in such a way that the hammer cannot touch the firing pin until the bolt is in battery.
I'm sure that would work!
Are you saying a totally new grip housing and throw away the old? I don't think I would need a new grip housing. What I would do is yank the guts out of the existing housing and replace with the FAL trigger .
If you can mod original parts, keep em. I would probably make a new grip housing strictly for the pieces in my drawing. The photos of the grip housing don't look like there's a lot of room for the drawbar and pivot block.
I'm looking forward to see the mock-ups of the your receiver section and FCG parts. :thumbup1:
Here we go:
Keep in mind the width is about 1.6" and the height is about 1.9". The charging handle goes on the RH side so I wouldn't want to get in its way, and there's a pretty big rail on the LH side that would give us some room to play.
This is what I meant about that striker needing to travel so darned far. And I determined the receiver is a flat 14" long, not 13 11/16" like I had guess previously!
Not much room for a striker guide rod:
And here is the trigger housing and parts... only 2 parts there - the trigger and the sear:
And finally the area for the "spur". It looks like that threaded hole would be sufficient to secure the spur, and it could even be brazed in place. I think the threaded hole was put there to facilitate the milling needed on the carrier:
The spur would need to be about 7/8" long:
You know, looking at my AR and FNC, I think I may be able to apply the KISS method here. Both actions smack of an AK style assembly.
After playing with the PK trigger housing some more, I figure that the modified AK-style trigger with the big L shape which I described may be slightly better than the FAL style. That would make the conversion easier because I have plenty of AK triggers & hammers laying around.
I may be able to weld that L arm onto a trigger which would then have a disconnector attached to it. OR maybe attach the disconnector directly to that shim. That may work best of all and would require the LEAST amount of work... and I'm all for that! ;)
Pookie any updates on the PK design?