Well, that sucks!
Consider doing what I did to my T\C. I'm not a fan of brass on a hunting rifle so I took the T\C brass, sanded off that "finish stuff" the factory applied to the brass, then using a brass blacking solution, made it all black. BTW, the triggers and trigger guard in the photo are repro's of a real Hawken. I never liked the T\C version so I just changed those.
The T\C trigger plate is not really case hardened. That T\C finish comes off pretty easy. IIRC I used Naval Jelly. Watch navel jelly....it will remove bluing off of anything it touches in seconds.
As durable as bluing or browning? Well, like anything else it will depend upon use. Using a blued or brown rifle enough and the edges will wear. I'm very happy with the performance and durability of the product. Now, what I did was (using some fine steel wool) "knocked back" some of the blacking in order to get a very dull brass. Here's what I ended up with and it still looks the same today.
Between cost and availability you'll be better off blueing your brass hardware. Blueing or residue from cleaning patches will blacken brass.
