Hi Paul, excellent post! I wrote a Reserve_PopSlot function that closely resembles Reserve_EmplaceSlot and added some tests. SPSC, MPSC, SPMC all work great, however I'm running into an issue with MPMC consumer thinking that the queue is empty because cIndices.mUnwrappedPushIndex == cIndices.mUnwrappedPopIndex but mSize is not 0. Have you experienced this?... If you send me your email I can respond with my implementation of Reserve_PopSlot. Thank you!