.I'm already having to buy receivers, front sight, rear sight, dust cover, rear trunnion, trigger guard, furniture, gas tubes, lower handguard retainer, FCG, pins, retainer plate and I'm sure I'm forgetting something
thats why I was thinking you could make the front trunion an RSB in one piece . RSBs are like $30 now . you could also make it take a gude rod an not need a piston like deal on the bolt .
you only need a AK gas tube if you wan it to duplicate a AK exactly . A 50 cent piece of tubing could replace a $20 original . No need for a $20 trigger guard thats not going to fit 9mm mags any way you just need a 30 cent piece of flat bar .
Id stick wiht the AK FCG an pins as there cheap . To bad you an I didn tstock up onthem whn CFS had trigger sets for like $3 .
the rear dust cover is going to cost you if you want a original look . I see the chinease ones with the rail on top pretty cheap on ebay . try to get a bulk price maybe . the rear trunion is going to cost you . one solutin is somehting lile jack squat sells . Im not sure how well they woul be reciveed on a manuafactred fore arm but for $10 an some welding you have a pistol trunion . If you can cnc front barrel blocks/ trunions an bolts a rear trunion should be easy .
as far as furniture there is not a lot super cheap . You can get AR stocks pretty cheap how ever .
Receiver blanks can be made for about $4
I think if you stray just a bit from the original AK look you can build the a lot cheaper . Im not sure how they would sell.
I have nver flet the need or want for a GB an gas tube on a blow back . Id be cool with a gue rod an nothing on top of the barrel . if its a short barrel pistol you dont really need a upper fore grip just small lower one if that . just a lip on hte bottom of the trunon would work to keep you hand from going forward .
I think a shorty pistol would sell more than a 6" or longer barrels one .
But your right if you use all original parts your only going to be saving on the cost of a trunion, bolt an carrier an you still have to make the parts to replace them so you looking at about 400 just in parts.
My thoughts have always bee use a $5 receiver flat a cheap $10 original FCG what ever springs you need an build the rest from scratch.