LOL. I'm about driving myself nuts trying to find a Ti tube that'll work with 1.37" OD cups. DM is the only vendor I've found that makes them, but of course they're out of stock. Found another vendor that has Ti tubes that are 1.369" ID. And Apogee's are 1.35" ID.
Am I looking at everything wrong, or is there no standardization of sizes happening here? I could pick up a few Al kits, but the stories I've read about Al tubes turning into grenades has me kinda not too interested.