Thanks a ton man. I've been wanting to get a quick detach system for my 551, but didn't like the Larue system for it. This is a very nice alternative! Picked it up tonight on eBay for $64.50 shipped from a very good seller named macknlou. Got my Magpul AFG off of him as well.racenet said:If you want/need a QD mount, use one that does not add height to your Eotech. This one works very well and has not lost zero in 1000's of rounds fired.