I've had a dozen Benchmades over the years and all have had perfect fit and finish, grinds, blade centering, etc. It's not that I'm not picky (I've found mistakes on half of the Spyderco and almost every Emerson that I've owned), I really think that Benchmade really has their s*** together.
I really really wish they'd make more back and liner lock knives, and stop putting Axis locks on everything....
It sounds like the 581 and 586 just need the pivot adjusted. I'm not sure how you could have so much play, the knife's washers are HUGE compared to most. I think that the only way to have that much movement would be that the pivot is too loose. That could also explain the OP's complaint of poor centering.
I really really wish they'd make more back and liner lock knives, and stop putting Axis locks on everything....
I'm with you on the Barrage line-up won't buy another i don't think.
It sounds like the 581 and 586 just need the pivot adjusted. I'm not sure how you could have so much play, the knife's washers are HUGE compared to most. I think that the only way to have that much movement would be that the pivot is too loose. That could also explain the OP's complaint of poor centering.