Sorry, I was wrong. The M5 screws I mentioned are the larger ones for the handguards and such. I think the smaller ones for the vertical grips might be M4.
So, I've got an FV-SR in a Boyd's stock. I love it.
I've never heard of these Manners stocks, and man are they cool looking, but dang they're expensive!
What's the story behind them?
GLWS!