You're correct about the 5304 model number designation. 82 total were manufactured.
Serials
530-04400 to 530-04431 (32)
530-04474 to 530-04499 (25)
530-04501 to 530-04521 (21)
530-04533 to 530-04536 (4)
Only notable exclusion is serial 530-04500 which is listed in the Ruger Serial DB registry...
I agree it's awesome, I assume he'd be looking to sell and I'll go top dollar cash. 👍🏻
Please message me directly, I’ll top anyone else’s offer. I’d truly like to purchase it.
You seem very knowledgeable, by any chance could you give me a generalization about how many 6 cylinder versions may have probably been produced (even a guess?)
Thanks again