Just caught your edit with the photo, that's great information to have. There seems to be so little out there in regard to the SD, seems like a great feature which I had precisely zero idea existed!
Follow up question which I suspect is more for
@JimFromHorshamlooking at his pile of bits. Do you happy to know/would you be willing to see how the extended picatinny into mlok top mounts sit on the SD. I imagine it's exactly the same as the A5, with the upper receivers/front end being the same in regard but measure twice cut once and all that. Toying with using one of those in combination with an
Arisaka Offset to push a torch up front without needing to mount to the suppressor. In my head it works, albeit a tad goofy... but that's half the fun with SDs, especially when jubilee clips aren't an (convenient) option given where the battery lives!