My dovetail cutter from LMS arrived on Friday and I've put it to good use! The scope rail is a normal AK style scope rail, but it needed several innovations to fit to the bullpup. I am going to polish and dremel off some of the rough edges, and paint 'er up!
The biggest problem is that I had to offset it to the side since your cheek weld is different without a buttstock. A standard dovetail mount simply won't fit with the handguards. That meant a "riser" mount that keeps the scope off to the left about 1".
The problem is that this thing weighs about 1/2 lb by itself, so I had to mill away as much as I felt comfortable doing and not harm the stability of the mount. The problem is that I would have had to move it over another 3/4" or so to clear the iron sights, so unfortunately the back up iron sights can't be used with this scope... you have to remove the scope first. Kinda sucks, but then again the sights are there only as a "backup" and honestly I don't plan to use them that often. And it really isn't THAT big a pain to remove the scope...
The pits on the face of the rail is actually from the steel block. I got the steel from a salvage yard, and I didn't realize the pits were so deep. They do not affect the function, they just look like crap. I may try to bondo them smooth. Note to self - ALWAYS SURFACE THE WORKING MATERIAL BEFORE YOU CUT INTO IT!!!!
You can see the mounting pin for the trigger/pistol grip bullpup assembly in these pics:
That requires some explanation. It is "THE" pin that literally holds everything together. It connects to a collar that I pressed and pinned to the barrel. That pin was made from a 5/16" bolt on the lathe. I knew all along that I was going to make a custom mounting point, so I used a normal AK axis pin during the building process. So this pin is like a REALLY long AK axis pin. It is a really tight fit, but it is just pushed in there. Even though it is extremely tight, wanted a positive lock to hold it in place instead of just friction.
I found that there is enough material on the scope rail to help fasten the cross-pin. I can't make it a "captive" pin like on an AR or FNC, but I plan to make a spring-loaded "pushbutton" retainer that mates to a narrow groove on the pin... kinda like you see on some flip-up sights or the pins like on the VZ-58. That will not be a big deal to make, really. Just a spring, a BB or small rod, a screw to plug the hole, and a matching groove on the cross pin so the BB will "snap" it in place.
I riveted it together like a normal AK sight would be - rivet head on the inside, "crush" side on the outside.
The scope actually adds more weight than I expected it would. The glamour shots... enjoy!