The Burris Signature Zee Rings (for Weaver mounts) are really an outstanding product for the price--a good choice for a field/varmint rifle. The polymer two-piece inserts are self-aligning, eliminating stresses on your scope. They also keep the scope from being scraped or chipped during mounting. The inserts eliminate the need to lap the scope rings altogether, and they provide a more uniform gripping surface on your scope than lapped rings. You can also use special calibrated plastic inserts to "pre-load" elevation or correct for inherent windage mis-alignment.
Some people have been confused by Burris' product names so here is a short explanation. A "Signature" ring set has the polymer inserts. A "Zee" ring set is designed to fit on a Weaver-style rail. If you want BOTH the inserts and the Weaver base, you need a "Signature Zee" ring set. Signature rings (both Zee and non-Zee) are available in either 1" or 30mm, and there is also a 1" rimfire version.
One huge advantage of these rings for the long-distance shooter is that asymmetric inserts are available, allowing you to preload the scope with up to 20moa of elevation. (Use a +10 in the rear and a -10 in the front). You can also rotate the inserts to center point of impact without adjusting your internal windage controls. This is a good way to correct a common problem on factory rifles--tapped holes for the scope mounts that are slightly off-axis. With the inserts you can center the scope relative to the bore axis without using up your internal windage.
We've heard tactical shooters, (who are found of dropping rifles out of helicopters), say that the Zee rings won't hold zero as well as $140/set mil-spec rings. That might be, but we've had them on our varmint rifles for three years and the zero stays the same. Plus we can pull the scope off the gun and it looks brand new--not a scratch on the finish. Jeff Cochran won the 2005 F-Class Nationals using Signature Zee rings on his 6.5-284.
Signature rings are also available in a conventional dovetail configuration for those who prefer that. A Double-Dovetail mount is rock-solid and offers the lowest profile. Signature Zees normally run about $35 per set for 1" diameter, and about $40 per set for the 30mm version, but we often see them on sale in the mid-thirty-dollar range. Additional inserts cost about $10 per set (3 pairs, one each of +/– .005, +/– .010, +/– .020). The only negative we've seen in using the Signature rings is that the blued versions are somewhat prone to rust, particularly the screwheads and under the inserts. Be sure to wipe some corrosion inhibitor on the rings before you install the scope. It would also be nice if they used a hex-head or Allen-head on the crossbolt; you'll find this feature on more expensive ring sets and it does make it easier to tension the Weaver version on the rails.
Recently, Burris has upgraded its 30mm Signature Zee rings to have four clamping bolts as opposed to two. Now the rings will be even more secure with heavy-recoiling magnum calibers (we never had an issue with the previous two-bolt version though). For 2006, they've also added a Medium (#420588) and High (#420587) Signature Zee 30mm ring set. Previously the 30mms were only available in Extra High (#420585) rings, or in the Signature (non-Zee) dovetail base model. With most barrel contours, the High 30s will work with a Leupold 6-20x LRT scope. Use the 30mm Extra High rings for a Nightforce or other scope with a very large front objective. Click HERE for the Burris Signature ring specification page.
Reader Report (From DarkEagle) "[My Dad and I] use the signature rings whenever possible. And we've used them on some stuff that IMO would make most lesser rings fail. For example, we've used them on XP-100s in calibers like .308 win and .358 win, both with no muzzlebrake. 300WSM and 300WM rifles. I think most of the alleged holding-zero problems are from misuse. Also, you can get the offset rings which can compensate for elevation, or a misaligned base. No scratching the scope tube, etc. I don't see how you can go wrong. I do wish that I could get a Torx-head cross-screw instead of a flat one, but you can't get everything. And the price is much less than half what some guys are paying for rings."