Burris specifies 1/4 MOA re-mount accuracy for the AR Signature QD P.E.P.R., meaning that across repeated remove-and-reinstall cycles the point of impact should shift no more than 1/4 MOA from the established zero. In practical terms at 100 yards, that is approximately 0.26 inches — well within the acceptable zero tolerance for most applications. For precision use at extended distances, it is still good practice to confirm zero after reinstallation, but for general-purpose, patrol, and competition use the return-to-zero performance is reliable enough to remove and reattach the scope without a trip to the range afterward.

The Burris Signature inserts are precision-shaped polymer sleeves that sit between the scope tube and the interior of each ring half. Because they are slightly oval (rather than perfectly round), rotating them or selecting inserts of different thicknesses in the front vs. rear ring pair introduces a controlled angular cant into the scope — effectively tilting it slightly forward or backward (for elevation) or left/right (for windage) relative to the bore axis. This cant shifts the point of impact at distance the same way a scope adjustment does, but without consuming any of the scope's internal travel. The available range across the insert set is 5 to 40 MOA. This is particularly useful for shooters who need to account for ballistic trajectory at long range, want to set a specific BDC zero distance, or are running a scope with limited internal adjustment range and want to conserve it for fine corrections.

Yes. The P.E.P.R. extended design was specifically built to maintain BUIS compatibility on AR-15 flat-top receivers. Standard-height fixed and folding backup iron sights can be used through or over the mount without removing the scope, providing a redundant sighting system on the same rifle. This is one of the design priorities of the P.E.P.R. platform. Verify with your specific BUIS model that sight height and mounting position are compatible — most standard AR-15 BUIS sets are designed around the flat-top receiver height and will clear the P.E.P.R. profile.

The three variants differ only in the inner diameter of the ring bodies, which must match the outer diameter of your scope's main tube. Check your scope's specifications for "tube diameter" or "main tube diameter" — it will be listed as 30mm, 34mm, or 35mm. Most mid-range and value LPVOs (including the Burris RT-6, Primary Arms SLx, and similar) use a 30mm tube. Some premium scopes (including the Primary Arms PLxC and various European-pattern optics) use 34mm or 35mm tubes. Using the wrong ring size will either prevent the scope from seating or allow it to shift in the rings, so confirming the tube diameter before ordering is essential.

The Burris RT-6 Tactical Kit includes the Burris P.E.P.R. mount as part of the bundle, so if you purchased the RT-6 kit, you already have a P.E.P.R. mount included. The AR Signature QD P.E.P.R. (this listing) is the QD variant offering quick-detach lever removal; the mount included in the RT-6 kit may be the standard (non-QD) version. If you want QD capability on your RT-6 setup, this mount is a direct upgrade path — same 30mm tube compatibility, same P.E.P.R. platform, with the addition of the quick-detach mechanism and 1/4 MOA return-to-zero capability. Verify which P.E.P.R. variant is included with your specific RT-6 kit before purchasing.