login...do you know which parts would be easiest to come by???
would a US made bipod count? how about a us pistol grip?
A bipod doesn't count...
The 16 countable parts of an AK rifle. No more than 10 of these parts may be imported.
(1) Receiver
(2) Barrel
(3) Trunnion
(4) Muzzle attachments(flash hiders, brakes, barrel extensions, barrel nuts)
(5) Bolt
(6) Bolt carrier
(7) Gas piston
(8) Trigger
(9) Hammer
(10) Disconnecter
(11) Buttstock
(12) Pistol grip
(13) Forearm handguards
(14) Magazine body
(15) Follower
(16) Floorplate
The bold parts are the most commonly available U.S. manufactured parts.
On a typical stamped receiver rifle you need to replace 5 parts with no muzzle attachment and 6 parts with a muzzle attachment.
On a typical milled receiver rifle you need to replace 4 parts with no muzzle attachment and 5 parts with a muzzle attachment, because there isn't a barrel trunion, it is part of the receiver.
When building an AK pistol, these regulations do not apply. You can not have a stock or forward pistol grip on a pistol.
http://www.ar15.com/content/page.html?id=80
I don't know which of the 5 US manufactured parts are in your NHM-91, but if I had to guess, I'd have to say the buttstock, handguards, hammer, disconnecter and trigger (and/or gas piston).
US manufactured 922r compliance parts are usually marked (even though there's no legal requirement to do so).
If you wanted to there's a couple of ways that I can think of to do it (assuming that the 5 current US parts in your NHM-91 are the stock, handguards, trigger, disconnecter and hammer).
One way... Install the K-Var buttstock and handguards and replace the pistol grip and gas piston (or floorplates), with US manufactured ones.
(overly anal technicality... if you use US made floorplates, the mag has to be kept inserted in the rifle in order to comply with the 5 parts rule).
I know it sounds like more trouble (and expense), than it's probably worth, but if you want a particular set-up and still remain legal, that's what you have to do... stupid law.
Oh yeah... from reading the link I posted earlier, you'll also have to buy a standard length pistol grip screw.