Your English is MUCH better than my Georgian or my Russian.
There is a problem with a US company selling a firearm to someone in another country. The US restricts export of many firearms, and to export a modern firearm requires special permits, and knowledge of the legal system. In turn, many countries limit importation of firearms.
To give you the short answer, there is no "website" as such that you can directly purchase such a firearm as you list. You would need to locate a firearms dealer here that has the rifle for sale, and an export company that can handle the paperwork to legally export the rifle from the US, and import it to your country.
You might begin by locating a firearms importer in Georgia, who will know of firearm exporters here in the US. Good luck.