All you need for the barrel is a gas block and new FSB. You can use Romanian/East German takeoffs from
Apex Gun Parts. Copes may have the parts also. Check the EE here on the site, someone may have them cheaper.
You can easily thread the barrel, a threading die, thread aligning tool (TAT) and handle can be obtained from many sources or rented from dinzagarms.com. No need to replace the barrel. You want take off parts, not new undrilled parts. The crosspin holes have always lined up on ones I have done.
http://dinzagarms.com/tools/tools.html
Ironwood Designs has a US made buttstock and pistol grip or you can obtain a Hungarian pistol grip from a different source, maybe
Copes Distributing.
While you have the barrel parts removed, replace the Hungarian lower handguard retainer with one from a different country which will allow you to use a wider number of lower handguards. That part runs about $15.00 and both Copes and Apex will have them. Don't forget a cleaning rod.
Here is mine, I put a Bulgarian buttstock on it as Ironwood didn't have any of theirs in production when I did it. You can sell your thumbhole stock on the EE for about $25.00.
Here is one I helped another member do before he blasted and refinished the rifle.
The original handguard retainer does not allow regular unmodified handguards to be used.
Hungarian handguards are smaller in the front.
This type of retainer will allow all other handguards to be used.
another source of FSB
Those US made stocksets you posted a link to appear to be Ironwood Designs stocksets. You can order
direct.
If you change out the handguard retainer you can use any countries set if being correct doesn't matter to you and you just want a normal AK setup.
You can even use these.
wood
polymer
Use a Tapco G2 single hook fire control group, US slant brake, US pistol grip and one other US part for your compliance parts under 922(r)
One of the Birch Tapco 3 piece US made sets would work if you change out the handguard retainer.
It would be pretty close to what the rifle originally came with though not exact.
http://www.sportsmans-depot.com/products/TAPCO-AK47-WOODEN-STOCK-SET(BIRCH).html
http://www.tapco.com/timbersmith/tsproducts.php
You might have to shim it a bit, JBWeld putty works well and takes minutes to set. These sets come with a pistol grip screw and nut you will need.
The Bulgarian sets from Apex can be refinished darker. I have a couple extra already done. Cheap way to get a stockset. They came without sling swivels but they can be found on the internet like I did for these.