I would stay away till a true track record can be established.
I have worked on a bunch of older Bushmaster agency FA guns that had BCG problems, they worked initially then what I later found out is they used slightly undersized allen head fasteners to hold on the gas key.
I found it out by accident when I purchased a quantity of new gas keys and screws to go through them all, the head of the older fasteners was noticibly smaller and metric.
With the correct fasteners, new gas keys and to spec installation procedures all those weapons are now running great.
If they were willing to cheap out a few cents on the correct fasteners what else would that original managment do?
They may end up being great.. time and track record will tell.
How do you establish intent?
Well when a naked man is chasing a woman down an alley with a butcher knife and a hard on, I figure he's not collecting for the red cross...Inspector H. Callahan