I have to say something, here, though, since you brought it up.  I have talked to so many guys--so many, no exaggeration--who talk about excessive muzzle rise, or even more common, the inability to control certain rifles on full auto, and I go back to my experiences at Knob Creek firing many "basic rifle configuration" type full auto rifles.  They were not that difficult to control, even off the shoulder, for an experienced shooter.  Sure, when I was a young and relatively inexperienced Air Force trooper, the M16 seemed difficult to shoot full auto, but in shooting it a good deal at Knob Creek decades later, it was not difficult at all to control, using short bursts. 

The 5.56mm aside, I fired the BAR off my shoulder--and found it not even unpleasant, much less difficult.  I hesitate to tell men that for fear they will disbelieve me, but it's a fact.  I don't believe half what I read about the M14 being so impossible to handle on full auto, for example.  I attribute it rather to lack of training and experience.  Of course that is what you get with draftees and essentially green troops--lack of training and little experience, so you have a self-fulfilling prophecy there. 

But the idea that the firearm is at fault seems to me to not be the problem.

I welcome comments from everyone--even if you just want to tell me I'm full of Shinola*.

* Shinola, for those too young to know, is a defunct brand of shoe polish.  Most here don't need to be told that.