The NRA has signed onto the transfer of military hardware to local police big time. Yet they are afraid of repression by said police forces. But nobody ever expects rationality and consistence from the NRA. Here are snippets from motherjones.com.
The NRA has long walked a delicate line between glorifying law enforcement and fanning fears of big, tyrannical government. In 1995, NRA executive vice president Wayne LaPierre infamously wrote of "jack-booted government thugs" and "federal agents wearing Nazi bucket helmets and black storm trooper uniforms," and he still routinely warns of imminent crackdowns on gun owners ...
Yet the NRA is also a trade lobby for firearms manufacturers, which may explain its soft stance on the militarization of American police. ... a multibillion dollar industry has sprung up to provide ever-bigger weapons and military-style equipment to law enforcement. Since 2002, the Department of Homeland Security has given local police departments $41 billion to buy new gear.
You see the problem for NRA - they fear jack-booted thugs but they are participating in creating jack-booted thugs. The events in Ferguson make the dangers of all this quite clear.
For more, here is a companion piece on warrior cops.