The US predominately sells two things: big "weapons systems" (radars, aircraft, etc.) to middle tier countries, and a comprehensive range of small arms both domestically and to allied countries.
The weapons which primarily affect individuals and civilians in conflict are small arms, landmines, and certain ISR and ground attack resources. As a percentage of the total, it's about 1%. It doesn't hurt the life of a guy in Jordan that his neighbors have F-16s with top-end avionics. It does matter to a guy in the Congo that a box of cheap AK-47s has arrived.
Within the US, arms are both an economic issue (LockMart, etc. are huge employers, and wisely spread production/employment across congressional districts), and a civil rights issue (for small arms; no one really cares about F-16s for private ownership). Either issue is more than enough to keep the industry safe.
Russia, etc. are the same.
What I'd really like to see is a great analysis of the domestic small arms market -- who makes primers, who makes powder, brass, rifles, importation permits for foreign mil surplus, foreign current manufacture, etc. That is vastly more relevant to the 2A issues than who makes radars.