Evening Peter, the straight 30 rd mags are quite rare items in the UKicon.

I can't remember if they all came from Canadaicon or Lithgowicon made there own.

No markings on mine whatsoever. Re the butts, I quite take your point from a service perspective, but today its a collectors perspective, sort of like you wouldn't fit a Late Rover steering wheel, or a 1998 A+ series engine in a 1967 Mini Cooper S.

Sad perhaps ( anoraks, yes, why not), but we collectors try to rebuild Rifles to represent a particular time frame of a types service history.

Tracking down and acquiring the "right" parts for the restoration is just part of the fun of owning any classic really...