Both sets of ring top halves are included with this mount and are interchangeable by removing the ring cap screws. The smooth tops provide a clean, uniform clamping surface around the scope tube — use these when you don't need an accessory mounted on top of the rings and want the lowest-profile setup. The Picatinny-grooved tops have a short Picatinny rail section machined into the top face of the ring cap, which allows you to attach a small accessory — most commonly a red dot sight or mini reflex sight — directly on top of the rings alongside your primary scope. This is a popular 3-gun and tactical competition configuration that gives you a fast-acquisition red dot for close-range stages while keeping the magnified scope available for distance. Swapping between the two top styles only requires a hex wrench and takes a few minutes.

This mount places the center of a 30mm scope tube at 1.6 inches above the Picatinny rail surface. Standard AR-15 absolute co-witness height (where iron sights appear centered in the optic's field of view) is typically around 1.4–1.5 inches depending on the sight system. At 1.6 inches, this is a high-mount profile — iron sights, if used through a scope mounted in this ring, would appear in the lower portion of the field of view rather than centered. For many shooters on AR-platform builds this is acceptable; for those who require a specific co-witness geometry, verify your BUIS height against the 1.6-inch center spec before purchasing. Folding BUIS can still be used alongside the scope without the co-witness consideration being relevant to everyday use.

Both are QD 1-piece extended P.E.P.R. mounts for 30mm scopes on Picatinny rails, but they differ in two key areas. The AR Signature QD P.E.P.R. (410352) includes Burris Signature polymer ring inserts that allow 5–40 MOA of elevation or windage cant to be dialed in at the mount level without using the scope's internal turrets — a feature aimed at shooters who want to preserve scope adjustment range or dial in elevation offset for a specific BDC zero. This mount (410342) does not include the Signature inserts, but it does include Picatinny ring top caps, allowing a red dot or other accessory to be mounted on top of the rings — which the 410352 does not offer. The 410342 is also slightly lighter (8.7 oz vs. 10.33 oz) and priced $10 lower. Choose based on whether you prioritize the insert-based MOA adjustment capability or the Picatinny ring top accessory mounting option.

Yes. Burris explicitly lists AR-10 and LR-308 platform compatibility for this mount. The Picatinny rail interface is standardized across flat-top AR-15 and AR-10 receivers, so the mount installs the same way on either platform. The 2-inch forward cantilever extension is particularly useful on AR-10 builds, where the longer receiver and different cheek weld geometry can push the scope farther rearward on a standard mount, compressing eye relief. The extended design compensates for this by moving the scope forward to the correct eye relief distance regardless of platform.

This listing is for the 30mm tube variant, which fits any scope with a 30mm main tube. The AR-P.E.P.R. QD is also available in a 1-inch variant for scopes with a 1-inch main tube, and a 34mm variant (which includes 20 MOA of built-in elevation cant) for scopes with a 34mm main tube. Verify your scope's main tube diameter in its specifications before ordering. Common 30mm scopes include the Burris RT-6, Primary Arms SLx series, Sig Sauer Romeo 5, and many other LPVOs and mid-range rifle scopes. Some premium European-origin and long-range scopes use 34mm or 35mm tubes.