There have been questions in the past on this, so I put together a little video.
As always this is "A" way. Not necessarily "The" way. It works for me and has survived just fine for thousands of rounds on a hard use rifle.
<iframe title="YouTube video player" width="853" height="510" src="http://www.youtube.com/embed/aoW5bHQqgis?rel=0" frameborder="0" allowfullscreen></iframe>
As always this is "A" way. Not necessarily "The" way. It works for me and has survived just fine for thousands of rounds on a hard use rifle.
<iframe title="YouTube video player" width="853" height="510" src="http://www.youtube.com/embed/aoW5bHQqgis?rel=0" frameborder="0" allowfullscreen></iframe>