I have one of these. Worked great for what I needed it for - being able to move and use a known scope mounted in QRW rings for loading testing on a couple of different AR's.
I no longer have any use for it - if anyone's interested just pm me.
I looked at the picture, looks like a longer version of the ARMS SWAN mount. But in the picture it does not show how it it locks to the receiver; no cross bolts etc. How does it work?
Done in Convention by the Unanimous Consent of the States present the Seventeenth Day of September in the Year of our Lord one thousand seven hundred and Eighty seven.
