It could be that HW's stance is voluntary, or in part to do with their agreements with HC.
I can see more problems with changing the law, than the status quo. I'm not sure the trade is that worried about a small amount of target guns... and there would be fun and games with grey imports anyway... foreign visitors wouldn't have them fitted.
The perception of power is a double edged sword. On the one hand you have the debate about what's wrong with 10.5 anyway etc... but on the other, it kind of open the can of worms that a manufacturer is expecting up to 1.5 ft-lb variation.
It will be interesting to see what comes out of the meeting, as I think a lot of air could do with a clear