JStor, Yes I also carry this ambidextrous sling mount & swivel for the A2 buttstocks. Comes with the mount, spacer for the stock, longer stock screw & Knights push button swivel. It's a little hard to see in the pic but if you look close you can see there is a channel that runs under the mount. This channel allows the sling swivel to swing from side to side for right or left handed users. This kit is $60 + $5 for US Priority shipping. Paypal + 3%.
The push button swivels are held into place wth a set of spring loaded balls, I like them a lot & have never had one release on it's own. The button requires some pressure while pushing in on the swivel to release.