Bought this for S&W 15-22 (not an AR15). I'm from NYS so I had to unpin/repin my stock to get the sling mount over the stock tube.
This is a well made quality mount. Not sure of Value but bet this if you don't want to mess around with second best.
Pros: Well Made
Cons: Not Inexpensive
This review was written in the old system and had content requirements that are different than reviews written today.