think you are overthinking this thing which is not surprising for a intellectual like yourself.
I think you are thinking about it in completely the wrong way, which is not surprising for layperson like your self that has no legal education or training.
I think the statutes and regulations say what they say. I also think based on your last post you don't really understand how lawyers (say a prosecutor) and judges read the law. For example you said:
After a law is enacted the intent does not matter.
This is a pretty asinine statement really. Courts should and typically do look to the "plain language meaning" of the text. However, when there are legal ambiguities in the what the plain language meaning is and thus you have legal questions about what a law means, and with respect to the laws we are discussing there are number of legal (as opposed to factual) questions that could be outcome determinative, THE QUESTION that the court seeks to answer is what was legislative intent.
Your discussion above misses what the pertinent legal questions even are.
I also think you have missed what the law actually does. I suggest you do a little reading. They law must be read and understood with relation to other laws and what they were trying to accomplish.
Reading the law "as written" I think leads to the most restrictive interpretation. That is to say I think it lends its self to the position that a gun assembled from foreign parts than can accept what the BATF calls LCMMs is illegal. However they fact that the Secretary is allowing sporter saigas in despite there being LCMMS that fit the gun makes it more interesting. I can think of ways to spin and argue that both ways.
At then end of the day it turns on what passes or fails the "sporting purpose test" (see above) as to whether 922r applies. If it does then you have meet the parts count (subject to the ambiguities of what "assemble" means, again see above) i.e. fewer than 10 countable parts. As a matter of nomenclature there are not "points" to speak of, only parts. It is simply a 1:1 count of parts. Points are used for other importation rules. To speak of points here is to use non standard nomenclature and to potentially confuse the issue for others. It is just a parts count, not a points count.
The bottom line is that there are a number of unsettled legal issues when it comes to 922r and the other code sections and regulations which inform it. Until these are definitively resolved (and ATF letters or opinions are very far from definitive) it is impossible to say with certainty how things would play out.
As such the best solution IMHO is to assume that everything will be construed against you and make sure you are legal given the very most unfavorable interpretations to the law. It is so comparatively cheap and easy to do so that I'm not sure why one would want to take even the slightest risk of being on the wrong side of it.
Can one put just a bullet guide in a stock Saiga and use 5 round AK mags in it without violating 922r?*
Long and short of it is, we don't know. There is a reasonable argument, based on the plain language of the text of the stautes and what ATF is saying makes a gun fail the sporting purpose test that one cannot. Read the ATF study I linked to in an earlier post and that post. In short it is a question of whether the ability alone to take what ATF calls large capacity military magazines (LCMM) makes a gun "non sporting" or do you need to actually have an LCMM in it. The fact that Izamash modified the rifles to not take standard mags rather than just shipping them with a 10 rounder suggests that the ATF required them to do so in order for the secretary to approve importation. This idea is bolstered by the romanian guns having modified mag wells rather than simply being shipped with 10 round mags. That would mean that a gun modified to take standard mags would violate the sporting purposes test. Thus, we would then have to ask whether installing a bullet guide, and filing the mag catch down falls within the definition of "assemble from parts." We don't know. As such, I would rather just buy some more 10 round saiga mags. They are cheap.
As I have stated previously the real interesting question then is what is the affect of there now being 30 round magazines that fit unmodified saigas? I can come up with arguments to suggest it means the secretary should stop allowing them for import. However, I can also come up with a number of ways to say it doesn't make saigas fail the sporting purposes clause.
Even more interesting is the report of 5.45 rifles that can use standard mags without modification. There are fewer ways to argue they meet the sporting purposes clause.
I really need to do more research on what the most current understanding of the sporting purposes test is. The ATF recently re-examined that issue with respect to shotguns. There was some movement in their findings. So much turns on that test that it is the key stone to many 922r questions. What is tough for folks is that you have to read through a number of other things to even get to that test affecting 922r.
Merely adding (purchasing) another 5 or 10 round which is legal for importation does not change anything.
Again you totally miss the relevant questions. Buying another 5 or 10 round mag does not change anything. However, modifying the gun so that it can accept 20, 30, etc, round mags arguably does. And that is true irrespective of whether one actually has or uses those magazines.
If it does how would you be able to replace the originial magazine if it was lost or damaged beyond use?
Buy more saiga specific 10 round magazines.
Are they really foolish enough to believe that Sarah Brady and other anti-gun liberals are to ignorant not to have already made this argument?
Considering their technical expertise of barrel shrouds . . .
http://www.youtube.com/watch?v=tSPrHl_6bO4
I'm not saying I agree or disagree with people saying don't write. However, the ATF could start to interpret things much more strictly if they were so inclined. They could also suddenly seek to enforce a lot more things too, and use those stricter interpretations. My guess is that 922r and other issues in this thread are not real high on the ATFs radar right now, or that of anti gun folks. Some feel it is simply better to let sleeping dogs lie. It wasn't until I really started going through the statutes, regs, and BATF publications that I came to believe just a bullet guide and mag latch shave might violate 922r. Folks worry that making some ATF agent do the same might lead them to the same conclusion. They then might take an interest in testing their legal theory, impressing a superior by taking to them, who knows where it could go from there. Again I'm not saying I agree or disagree with their position, but its not like they are absolutely crazy or stupid or naive for having it.
I think I'll bow out of this discussion (at least until there is a written response from the ATF, at which point I will likely have to explain to people the legal significance of such a response as most people get that wildly wrong) as there just isn't much more to say. People, myself included, can have whatever interpretation of the laws and regulations linked to in this thread. However, that does not mean they are right or that they will be accepted by those that really matter.