[Acog]

The Mighty Eighth War Manual states the gryo sight was shipped and "installed on as many fighter types as possible". It also states the K14 and K15's were installed at the factory in all 51's.

I know I have spoke with pilots who did indeed have a K14 in their P38J10 through J25's, so I would wager it was a field mod, not a factory install.

Should it be mod'd into the J and L/Late, IMO, yes. But I'm just one man. =)