I don't think titanium would be the best choice for a bolt. Whatever material you use, you'd probably have to use stainless steel inserts on the contact surfaces to address wear. This would be the edge that the sear catches, and depending on what material you use for the rest of the bolt, maybe a thin sleeve around the main part of the bolt. Maybe the bolt stem. But I think for a lighter bolt, the best way to go would be some sort of plastic with a stainless steel edge.
As soon as you slide the valve into the mainbody, the spring is compressed to a certain length, no matter how long it was to begin with. The result is different strength springs. If you want a spring shorter than the gold spring, just cut it down.
Originally posted by egb groupie

Comment