i've got about 400 rounds of 115gr and another 600 147gr subs through my Obsidian 45 so far and haven't cleaned the baffles yet. Black as hell but it runs great, no issues. Haven't swapped the mount back to the piston to shoot 45 on it yet.
Missed the boat by 2 mins on the PSA Eotech sale. Had EXPS 3-0's for $419.99 =/
They are still selling some XPS 2-0's for $429.99 - which is still a pretty good deal.
It's totally friggin' random I swear. I've bought enough guns to get me through a decade worth of subscriptions and i've seen maybe 8 total issues in the last 4-5 years.