If the bolt-stop screw was an issue, it'd be an easy fix for Howa or users to correct. Since the factory apparently hasn't addressed it, I figure it's nothing much to worry about. Actually, I've never looked at it on mine. Have to give it a look next time I have one apart.
Shiitfire,
Add ratsmacker to the list above.
Jason
To be clear, it's not the bolt stop itself, but the screw, which is danged near small enough to be on eyeglasses. They shear off pretty easily. Maybe they're heat-treated too hard?