Hello, I have a side sling attachment on my current set up. It however does not have a lower sling attachment which is what my sling is made to fit properly. My sling moves around a little bit altering its placement on my body due to its lack of being anchored down. I have a sling attachment that still has the pin in it but can be taken off and used for my new rifle. I am a cheap ass and want to put the sling attachment on my new rifle. What are the steps to take off an old sling attachment from another rig and put it on my new rifle? Thanks