While wonderfully light and strong, all titanium grades are not created equal. Some folks will tell you that Titanium receivers have a limited lifespan. While this is may be true of receivers made from Ti-6Al- 4V (Ti 6-4), it is completely false when referring to the Zenith. The Zenith is machined from Ti-6-2-4-6 bar, a very high strength, triple vacuum arc re-melted (triple VAR) Solution and Precipitation Heat Treated Beta phase alloy. Unlike Ti 6-4 which is an alpha and beta phase alloy, and exhibits HCP and BCC crystalline structures, Ti 6-2-4-6 being beta phase is BCC only. While Ti 6-2-4-6 enjoys a flat S-N curve at high cycles and retains a high mean stress, Ti 6-4’s curve keeps descending, offering a lower mean stress over time. What does all this technical jargon mean? Ti 6-4 is more sensitive to high cycle fatigue (HCF) and crack initiation than Ti 6-2-4-6. I know which one I’m putting my face behind, and our name on.