Could someone here please confirm if the dust cover on these uppers are loose enough that would pop-open when closed even with a slight tap on the upper, it would open up with or without BCG inserted. I'm not sure if this is common on these and I'm thinking it could be a weak detent spring of the dust cover.
I just checked ... my 10.5" dust cover is just as 'tight' as on my Danish upper and my SP 1.