Im staring at a striped bolt and extractor from a AK an d thinking the factory style is doable. IM not real fermilular with the AR stuff I have a couple striped lowers and perhaps now is the time to order some of the parts for my ARs so I can study them.
It would be easy to use an AK extractor if you have a mill. The AR firing pin is easier to make work, the pin to retain it can be less precisely located and it'll still work. Maybe a FAL firing pin, it has a spring, and would be somewhat easy to make the hole for, so long as you have a few different size drill bits.
I can and will be able to use a ordanary reciver like a NDS 3 or bent flat. the trunion location and bolt length would be the only differanses. if I can cut two inches of a reciver and still make it work I will. how ever a standard reciver and a longer trunion or just pressing the barrel back would acomplish the same thing and allow a 4-5inch barrel abd still be a short gun with little barrel in front of the reciver. I just think a shorter reciver might look better. I am already planning on a custom bolt and have a mill for the grooves. a two piece ricever will work but Im trying to build some thing a little better or fancyer. I may try to sell few parts down the road and I want it to be right. the pistol may very well be a guide rod build. I have some ideas Im saving untill I get it all on the bench. all your ideas are good and along the lines of what im doing.
ordinary AK receiver and rails
custom front trunnion with hole for guide rod.
custom bolt - you could saw the slots in the sides, or mill steps in a second piece and bolt or weld it together
AK firing pin, extractor
press barrel in so it lines up with the magazine feed lips, as neededbout something along this line: