I have this mount on my Springfield M1A and I like it alot. It sits low on the reciever which in turn makes scope sit lower and my cheek rest isn't too high. I use Leupold QRW rings so I can go to irons if need be. I found an article Lee Emerson wrote,M14 Scope Mount FAQ, which had a few tips on how to install th ARMS18 mount. In particular is the reciever groove spec on some rifles, anyway, just sayin I would buy another one. I don't have any trouble with brass jamming up the bolt, ejects fine,no problems with reloads, factory and surplus.