[Text: Removed] -- the facts I've already posted show your claims are false.   But here's some more:
Recognize this guy?
His nickname is "the Mailman", and he's an NRA board member -- that means a majority of the most active NRA members voted for him; in fact he was among the top five in vote totals.
As for NRA membership, in 2016 that reached a milestone:  40% of members were racial/ethnic minorities, a number that has continued to grow.  Sadly that varies widely by state; in some southern states the number skews heavily white.  Those numbers surprised me; I would have guessed 15% minority, 20% women, and in fact if you take just the members over 50 my guess is a little high.  And that last is why the media view of the NRA is skewed:  at large public NRA events, it's that older contingent who tend to show up (can't find it at the moment but I saw an estimate that the average age for convention [and other large event] attendance was around 55).
Your claim about filing for bankruptcy also fails:  the effort to reach out to minorities started not long after I got my university degree, in the late 1990s.  It stumbled along for years because the NRA couldn't find a high-profile minority figure to champion the cause (Malone wasn't interested in a task that would inevitably embroil such a position), but in 2013 this guy stepped up:  
Colion Noir.  (Also worth noting as a minority person in the NRA is Chris Cheng, an Asian shooting champion who is also outspokenly gay; he's a popular NRA commentator.)
Another reason the public view of the NRA is skewed is that the organization spends over two-fifths of its dues income on fundraising, and the big donors tend to be "OFWG" -- old fat white guys -- so the advertising is slanted to reach them (another thing due to Ackermann-McQueen, since the more money spent on fundraising the more money they earned).  That figure for fundraising spending is sufficiently ridiculous it has been brought up in court as evidence of corruption.