I am currently waiting for Burris to replace two sets under warranty (and I had to pay the shipping)!

I bought two sets of these, and when I tried to tighten to the rail, I snapped my Torx socket!
Figuring Harbor Freight tools may be a bit sketchy, I went to Lowe's and purchased a Kobalt Torx socket - it hung in there longer than the Harbor Freight Torx socket - it did actually bend the mount enough to clamp pretty tight, but there was still a slight bit of play. When I tried to tighten in order to remove the final bit of play, it snapped the Kobalt bit!

Figuring maybe the wrench they sent with the rings was made of stouter stuff, I tried it, and while it had that smooth feeling like it may have been tightening the screws, I was actually bending the teeth on the Torx wrench that came with the rings (the wrench finally slipped after the Torx teeth had bent enough).

Searching the 'Net, I see some others have also had this problem - some have put the rings in a vise and closed the mounts up for a closer fit when you initially slide them on the Weaver rail. I contacted Burris for their OK before I tried this, and they told me to send them in for replacement - said they had some get out that were made with steel that was too hard (no crap)!

I knew I was using more force than should be required, but if they won't tighten, waddya gonna do? These are the first rings I've had that did not use a 2-piece mounting clamp.

I'm giving them one star based on my experience AND having to pay shipping to Burris for a factory defect!
If the ones they send back will tighten and work OK, no doubt I'd raise my rating to three or four stars, but I'm still waiting at this point.

Only reason I put up with this much is I'm having a hard time finding silver rings to match my silver Nikon ProStaff scopes.
My other choice was Weaver Grand Slam rings in silver, but they're impossible to find, AND they are currently going thru a shakeup with a redesign of their rings (you can read my review of them on Amazon).

BTW - one thing I did not like about the Burris Zee Ring line was the regular screw head on the mounting bolt - everybody's picture still shows the regular screw head, but I was told (due to customer demand) that they changed the mounting bolt to a Torx head to match the ring bolts. The two sets that I received / sent back to Burris for replacement both had a Torx head bolt on the rail clamp.
I am currently waiting for Burris to replace two sets under warranty (and I had to pay the shipping)! I bought two sets of these, and when I tried to tighten to the rail, I snapped my Torx socket! Figuring Harbor Freight tools may be a bit sketchy, I went to Lowe's and purchased a Kobalt Torx socket - it hung in there longer than the Harbor Freight Torx socket - it did actually bend the mount enough to clamp pretty tight, but there was still a slight bit of play. When I tried to tighten in order to remove the final bit of play, it snapped the Kobalt bit! Figuring maybe the wrench they sent with the rings was made of stouter stuff, I tried it, and while it had that smooth feeling like it may have been tightening the screws, I was actually bending the teeth on the Torx wrench that came with the rings (the wrench finally slipped after the Torx teeth had bent enough). Searching the 'Net, I see some others have also had this problem - some have put the rings in a vise and closed the mounts up for a closer fit when you initially slide them on the Weaver rail. I contacted Burris for their OK before I tried this, and they told me to send them in for replacement - said they had some get out that were made with steel that was too hard (no crap)! I knew I was using more force than should be required, but if they won't tighten, waddya gonna do? These are the first rings I've had that did not use a 2-piece mounting clamp. I'm giving them one star based on my experience AND having to pay shipping to Burris for a factory defect! If the ones they send back will tighten and work OK, no doubt I'd raise my rating to three or four stars, but I'm still waiting at this point. Only reason I put up with this much is I'm having a hard time finding silver rings to match my silver Nikon ProStaff scopes. My other choice was Weaver Grand Slam rings in silver, but they're impossible to find, AND they are currently going thru a shakeup with a redesign of their rings (you can read my review of them on Amazon). BTW - one thing I did not like about the Burris Zee Ring line was the regular screw head on the mounting bolt - everybody's picture still shows the regular screw head, but I was told (due to customer demand) that they changed the mounting bolt to a Torx head to match the ring bolts. The two sets that I received / sent back to Burris for replacement both had a Torx head bolt on the rail clamp.