M38a scope for your E11 blaster or for your WWII tank afficionados.
All exterior measurements taken with digital calipers from an actual M38a scope. Can't get much closer unless you go to the real thing.
This is hollow - there are no optics or glass in it.
The scope area is 3mm thick and the the legs are solid. There is a cheaper version that will be 2mm thick throughout with 10mm bases on the legs.