Nice work there, 1066. I can do bits like that, and do, for my small steam locos, but what I can't do is work stainless steel to the required degree of precision without a lot of expensive carbide tools.
The part in question is just a rod, basically, as you know from your Remington, but the Ruger version has a lot of extra steps in it, and a semicircular bolt cut-out [the weak part]. As the last company kept my drawings, I'll have to re-do them, and I'll PM you with the details when I get to it.
Thanks.
tac