And back to the subject at hand...

Here's a shot showing the size of the action. You can also see the poor fit between the handguard and action at the bottom. What's happening is that as the takedown barrel's lug rotates into its mating lug on the receiver boss, the poor fit causes the muzzle t lift upwards, taking the handguard up with it. The handguard itself mates perfectly with the action when it's not attached to the barrel, but then what good is that?