Mitt’s message to the gathered NRA crowd can be found here.

As for the reception in the room, it was fine. The difference between a live speech and a video message is huge, of course; listening to certain lines, I knew they would be applause lines in a live appearance but there was no pause on the video. (Also, it had a weird “Max Headroom” feel, as it was a very close shot of Mitt’s mug.)