Bushnell R3 4-12x40 DOA-QBRR3 4 12x40 Riflescope with DOA Quick Ballistic The R3 4 12x40 with DOA quick ballistic reticle gives you more magnification for greater detail on farther shots. The one piece, 1 inch tube will provide durability in the field while EXO Barrier on all of the multi coated lenses will protect and keep your glass clear by repelling water, oil, dust and debris. See longer and later Experience brighter, clearer views from dawn to dusk with our 3X Optical