25.4mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 71mm, 72mm, 73mm, 74mm, 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm, 82mm, 83mm, 84mm, 85mm, 86mm, 87mm, 88mm, 89mm, 90mm, 91mm, 92mm, 93mm, 94mm, 95mm, 96mm, 97mm, 98mm, 99mm, 100mmAccufire Technology, AIM Sports Inc, Airforce, Athlon Optics, Barska, BSA, Burris, Bushnell, Cabela's, Crimson Trace, ELCAN Specter, EOTech, Firefield, Gamo, Hawke Sport Optics, Kahles, Konus, Leatherwood Hi-Lux, Leapers, Leica, Leupold, Mueller, Nightforce, Nightforce Optics, NcStar, Primary Arms, Pursuit, Revic Optics, Riton, Sig Sauer, Sightmark, Sightron, Simmons, Steiner, Swarovski, Tasco, TRUGLO, Trijicon, U.S. Optics, UTG, Vortex Optics, Winchester, and Zeiss.