Our IL2 is not an early model. Early models were single seaters. Then they cut a hole behind the cockpit and put a gunner there (in the open air) then later they actually built the plane with a rear seat, and with an enclosed gunner. The crux of the matter is there were MANY IL2 variant, only the last at the VERY end of the war having reflector sights included.
I don't fully believe your comments regarding P-40Bs and lack of reflectors. I believe it has been brought up before and contradicted in the past.
I wouldn't believe them myself Krusty until I dig up some sources, you know better in this forum, and I'm jogging them from pure mortal memory on this issue.
My recollection is early P-40s pre-US involvement in WWII were being cranked out as they were one of a few aircraft at the time approved for lend-lease export, as such they were very basic and lacked many if not most provisions for combat capable aircraft when they got off the production line, including if I recall correctly their guns, radios, and (since they had no guns installed) no gunsights. Those comming off the production line that got shipped overseas weren't much if any different comming off the line than those marked to be flown by US services. Much like those that got delivered overseas, the ones delivered to the US needed provisioning of such things. I'm pretty sure one of the standard provisions for the P-40 by the US was a reflector sight, ontop of the guns and radio equipment.... however, and here's the kicker in my head why I don't think early P-40s should have a reflector at all, most these early US-provisioned P-40s didn't actually see any combat. The ones seeing the majority of combat, of the early P-40 series, were the ones exported from the US, and what they got provisioned or were capable of provisioning to them varied very very much from plane to plane and theatre to theatre, and many if not most did not have a reflector sight (which the pilots and their commanders wanted but I believe couldn't, to the best of their abilities and various circumstances, obtain).
Later model P-40s, post pearl-harbor, had more combat provisions installed in them at the factory and came off it more war-ready for both US delivieries (of cource) and those being exported to aid our allies in their war effort.
And my argument for the IL2 is more of speculation: that it apears we have one of the later production models, we certainly have the 37mm option that only became available later in their production, so it is not unreasonable or even close to far-fetched to request a reflector sight that the later models also stated seeing as they became available to them (much like the 37mm cannons).