I just hope that they have improved the mounting of the ACE AKSMS (if that's what their bringing back). The original mounting method was prone to cracking the mount itself and wasn't very stable, I believe that's why they stopped selling it, another problem was that it wouldn't fit "ALL" AK's. IIRC, the Bulgarian and some Romanian rear sight blocks created some of the mounting problems. Wham-Bam installations of parts has always been a hit or miss type of thing for AK's due to their sloppy tolerances
When I bought and sold the last stock of the remaining ACE AKSMS mounts, I had to re-design the mounting system to provide a rock solid base with which to attach a red dot. It ended up as a custom-type installation but really nothing that complex for the AK builder.
Hope they get it right this time.