I feel like an idiot because I am missing the obvious, but perhaps a gentle hint for a dense person will set me in the right direction.
At least some of the time, I cannot get one of my two weapons to fire while gunzerking. One of two things seems to happen. Either the gun runs out of ammo, but wonāt reload, or it simply wonāt fire. The last thing only seems to happen with guns which do not have an automatic feed, such as Jakobs weapons. I am pretty sure I am clicking the appropriate mouse button (left for the right weapon, right for left), but sometimes (not all the time) itās leaving me in the lurch. What am I not understanding?
thank you much in advance
I donāt play on a PC but I would suggest that you check and see if you can fire on a different Sal or another character- it might be something physical with your mouse rather than the gameā¦
If I recall correctly the jamming occurs because, while Gunzerking, Inconceivable prevents the weapon from firing or automatically reloading when reaching 0 ammo count in the mag/cylinder/tube. I donāt remember any fix outside of simply manually reloading (or not specāing into inconceivable).
Hey thanks much.
I can fire well with anybody but Sal while heās zerking.
I have specced into Inconceivable, Iāll see if that changes if I take Filled to the Brim instead. I can manually reload, but I think that forces me to reload both guns, so kind of suboptimal. But that would be a good explanation, thank you indeed.
If you stop firing during an inconceivable chain where there is 0 ammo remaining, the gun will effectively jam. From my experience, this only happens if you stop firing during a chain at 0 ammo. As mentioned above, reloading does correct this, although not really the best, itās not all that bad.
the best fix is to never let go of the trigger.
ā¦EVER!
Just keep firing⦠forever!
and ever
Ok, serious answer this time 
The bug occurs when Inconceivable is active on one gun while the other reaches 0 ammo. Inconceivable will allow that gun to keep firing (so the game will suspend the reload animation) If you let go of the trigger during that time, the gun will not reload (since it could theoretically still shoot) and when Inconceivable deactivates, youāre left with a gun that doesnāt reload automatically.
The best fix for that is to not let go of the triggers.
You probably have Keep firing anyway, so you have nothing to gain from letting go. If you donāt let go of the triggers, you will always avoid that bug, guaranteed.
If you have to let go of the trigger, make a habit of reloading manually immediately, empty or not: itās a good reflex anyway, You will avoid that bug and it reactivated L&Loaded.
Speccing out of Inconceivable is not advisable: those chains of free shots coupled with Money shot are one of the most powerful things in the game. And to say nothing of the free ammo and delayed reloadings. Simply put: itās one of Salvadorās best skills, just learn to play with itās quirks 
It works if mainly using jakobsā weapons though.
Depends on your build
I quite enjoy shooting a Quad 6-7 times between reloads 
And I rather prefer a higher money-shot frequency since Sal doesnāt have much problems achieving a reliable reload speed with jakobs shotguns.
Like I said, it depends on your build
But youāre right: a high frequency of moneyshots without Inconceivable makes for a pretty good build 
Iāve experienced what you describe before many times with only 5So6 in my build. Itās what happens when the next shot would save ammo, but you magazine is empty. It overrides the automatic reload, Borderlands 1 has the same issue (with Lilithās Phoenix).
Iām only level 18 and so I donāt have any great combinations of skills or gear yet.
Honestly, if I could ānever let go of the triggerā, Iād be happy. For an old man like me, itās actually kind of hard to manually āfan the hammerā with both fingers simultaneously. If I were using automatic weapons in both hands, I wouldnāt have that problem as much, I think.
Yeah, 5so6 has been known to do that too, to a lesser extend than Inconceivable though 
Iād venture to say itās great. But thatās just my opinion.