I've got video proof that they are not stumbling even under extreme pressure on solo veteran and it needs to be fixed. That's 5 Barret 50 cal shots into it's back with no stumble. But then you see me Tec9 the armor off another and it stumbles within moments. Here's another example in a later level of 6 Barret 50 cal shots, with 4 straight to the weakpoint not stumbling a Crusher.
At first I was like "pfft, I stumble them all the time" but then I double checked just to be sure (as I try to do) and it turned out all the stumbles I was remembering was the forced stumble from breaking their armor.
/u/TRS_TheGentlemanSQ I just scanned through almost 2 hours of solo veteran gameplay (2 links to different sections listed above) and did not see me stumble a single tallboy, bruiser, or crusher with the Barr...