PST: 4x zoom, FFP, 30mm tube, zero stop, Illuminated, matching reticle/knobs Razor: 4x zoom, FFP, 35mm tube, zero stop, Illuminated, matching reticle/knobs XTRII: 5x zoom, FFP, 34mm tube, zero stop, Illuminated, matching reticle/knobs It will all depend on the glass quality and durability...