Thanks, Dustin. So, it's totally related to the bolting design.

I tend to like the simpler designs more. No hold-open mechanism = less stuff to wear out and break.

But, sometimes the simplicity counteracts itself, such as in the case of a Fox. Extremely low number of moving parts, but having a rotary bolt it needs the hold-open feature to assist in closing the gun, adding more parts.

Best, SRH

May God bless America and those who defend her.