That sounds right from what I see tossed around here, but I’ll leave that to the gas port whisperer to confirm. Lube is definitely key. Mine wasn’t that bad, and I was feeding it pretty decent ammo, but I think I was well north of 100 rounds before I started to get consistent hold open on the last round. I know I was lighter than I needed to be on lube during that period from what I’ve learned here.