(Ported over from the FB thread)
To expand on what
borebrush said above, a little background on where that PSA came from:
Story time gentlemen. Got a little anecdote for you that I'm sure you'll enjoy, so grab a seat.
Learning occurred today. I have Chad Mercer to thank for that. In my HK416 post he said something short and concise, but it contained so much more insight and imparted more knowledge in one sentence than the entirety of the shit show this post turned into, that for me it was a eureka moment, and one I'm compelled to share.
He said, "The roll pin and spring weren't intended to hold the weight of the extra mass of the BAD lever."
Ah! It makes sense now! So the issue of the BAD lever is that the bolt catch spring is the weak point, whereby as the spring loses tension over time, the weight of the lever pulls down on the bolt release paddle and raises up the bolt catch, causing the premature bolt lock, and failure to lock back malfunctions as the part fluctuates.
*Now* I can understand why a rifle that was working fine with a BAD lever might suddenly start having issues.
Facts fly a lot farther than conjecture in my world, and it gets hard to filter opinion of heart from founded conclusion when pointless aggression and bravado are introduced, and you end up with "The BAD lever is stupid and if you like it you're retarded and full of shit" instead of facts regarding the mechanical aspect.
Now we understand WHY there's an issue. More importantly, now we know how to fix it if people prefer to carry one. There's a confidence that comes with knowing the root of a problem beyond a bad reputation. I'd have many more arrests under my belt if I could base my cases on hearsay/he said-she said instead conducting a thorough investigation proper.
That all being said: Now we have a simple "be advised": If you like the BAD lever and you're comfortable with its use and operation, just be mindful of your bolt catch/release spring over time. No different than preventative maintenance on your car. Spare parts are cheap & plentiful.
Or just don't use one. Up to you at the end of the day. I understand several have removed their BAD levers as per this discussion. Now those guys will be able to articulate why beyond "well a few guys told me..."
Again, I'd like to thank those instructors and SMEs who participated there and took a moment to teach and impart knowledge.