which buffer is everyone using?

[rasp65]

Bolt bounce occurs when the bolt carrier slams against the barrel extension and bounces back. The weights in the buffer are able to move a little and if they are sufficient they will strike the front of the buffer as the carrier is rebounding from the extension. Here is a link to a video showing it: http://vuurwapenblog.com/?s=bolt+bounce You can see in the video how much more the gun moves around with the bolt bounce.