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If you have 1000 unique and worth reading articles instead of just words filling the paper then the advice is to add them slowly on your website (may be by adding a blog section on your website). If you content really contains value and if your content can really help users then you can get tons of link from different root domains to get SERP benefits (obviously you have to push it to the targeted audience).

Adding it on a separate domain will help your main website get a link from 1 external domain and if you content really is helpful, adding a content n the home page will help you get more links from different root domains.

Well, if I would be at your place I would have select “AK-47” as the best option and this would be the justification for me.

Google Considers ‘-’ dash as a space so in Google eye ‘AK-47’ and ‘AK 47’ will be considered as same. Now I have two options ‘AK-47’ and ‘AK47’.

Ultimate target is to get better visibility in Google (mostly it is) and to rank well it’s a combination of On-page and Off-Page optimization. I believe with a page ‘AK-47’ and some variation of AK-47 and AK47 in link building activity will more likely help me rank well for both the terms.

Even if you see the results in Google for these two terms you will not find much difference (at least on the 1^st page)