Microbest BCG ID

[prepare]

Is there a way to identify a Microbest BCG? Any special marks or identifiers?

[Steve-0-]

The bolt is marked MP (stamped) but is HP/MPI
The cam pins tend to be dark grey not jet black
The chrome lining spills over the face of the carrier slightly
Judging by staking is tough but proper grade 8 screws are used and have uniform oval staking marks.

Hope this helps.