Have a Enfield Cup launcher, RIA 1942 marked

[vmmv1]

Trying to find out info on a RIA 1942 cup launcher. a little longer than the standard, no side vent. Anyone know anything about them, never seen one before.

Information

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[Alan de Enfield]

Some pictures may assist :

[breakeyp]

RIA ???????? RFI (Rifle Factory Ishapore) ?

[Alan de Enfield]

RIA ???????? RFI (Rifle Factory Ishapore) ?

That was my 1st thought, but then he says it's "longer than normal and has no side vent" for distance adjustment,

[lithgow1918]

Which part is marked with RIA/RFI, the base or the cup? Also pictures would help a lot.

[WillSarchet]

Is it perhaps an American VB launcher? Would be odd to have a 1942 date but possible I suppose.

[Alan de Enfield]

I've been doing a bit of research and can find nothing useful.

I'm assuming RIA is Rock Island Arsenal, but can find no evidence that they manufactured parts or accessories for Lee Enfield Rifles.