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The Burris Optics AR-T.E.R. Extension Ring, also known as the AR Tactical Extension Ring, is a 30mm ring that places sights 1.8" forward with a centerline height of about 1.65", ideal for lining up for use with the AR-Tripler optic. This ring features an aluminum alloy construction and uses a quick detach lever system to secure itself to Weaver/Picatinny-style rails.