There isn’t a :28 sec mark on this video.
Sounds like a fully-auto or bump-fire stock as you suggest.
“There isnt a :28 sec mark on this video.”
Yes there is its on the 2nd video about 2 posts down. I forgot to post it in the 1st post. Here it is again.
https://www.youtube.com/watch?v=yCfqhsQLnGc&feature=youtu.be