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I'm sure there are those on this forum who will know. I have several boxes marked .303 inch Mk 7 I.S.A.A. (under an arrow).
The headstamp is:
R(arrow)L
51
and an upside-down 7.

I pulled a...

Hi lonewolf -
My original MK I - sn 1,110K - has a C 8 bolt.
Hope this helps -
XRING

Unless someone spots fake parts, that carbine will go for more than $5K -

XRING here - just got logged in. Been a good 15 odd years on CSP. Glad to see several familiar names making it here...
regards
XRING

XRING here, just got logged in from 15 years on Culvers Shooting Page.
regards
all
XRING