Are you having a problem every 60 rounds fired or the first round of a specific magazine?
I have a Nikon on qd medium height rings I think. It just clears the rear flip up sight.
I have Vortex on a few others.
Was it the same mag in the rotation? Did you take the bcg out and clean it? I bought a sport 2 as a first ar swapped out the stock and handguard for a drop in mlok and added a 3-9 scope on it. The front sight post won't be noticeable with the scope unless your running low rings or at a sub 3x...
I'd get this upper which includes the bcg and charging handle. It would knock $100 off the whole kit.
https://palmettostatearmory.com/psa-16-mid-length-5-56-nato-1-7-nitride-13-5-lightweight-m-lok-upper-with-bcg-ch-mbus-sight-set-516447488.html