I had a BSA in 30-06. I think it was a Monarch,,was a long time ago. Aluminum floor plate and trigger guard IIRC, so maybe it was a lower priced version.
It took some sort of special scope rings that I never did get.
The bases were made as part of the receiver.

It was heavy compared to the other 30-06 sporters on the used gun racks at the time, the receiver had a lot of bulk to it. But I bought it for the same reason... It was different.
..and had a very smooth action and a decent trigger.