Does anyone have any opinions/experience with the bump stocks on the AR-15? The video on military gun supply and on youtube is fairly dramatic with the rate of fire achieved. However, I've had one gunshop dealer tell me that they do not work as advertised. In the videos they are not much less than a fully automatic AR-15. I would welcome opinions/comments as I am considering purchasing one. One last thing, I have a Bushmaster Carbon-15 with Red Dot sight. Even if a bump stock works as advertised, would this be ok on this particular gun? I sent an email to military gun supply and they said it would, just checking with possible actual users.