Apple is one of many companies taking heat for allowing NRA TV to be broadcast on its platforms, The Huffington Post reports. A growing number of companies have severed ties with the gun lobbying group, but the NRA TV app is still available on the Apple TV App Store. Shannon Watts, founder of Moms Demand Action, has created a website aimed at pressuring streaming platforms to ditch the channel, which she calls a media arm of the gun lobby that “propagates…