Back from the "crypt"!

An interesting Oz connection.

Drawing No. U-52831, Issue 8. Drawn by K. Sankey, 12 March 1965. (Reason for redraw: Chamber re-designed (Bullet Leede. (sic)).

This is a drawing of a VERY post WW2 barrel for a rifle that saw rather limited service in Oz.

Bayonet lugs are NOT shown in the drawing. Thus these barrels are NOT for "Service" use, but for the Rifle Clubs, which, at the time were still very much a part of the "heirarchy" of defence: (Regulars, CMF (Reserves) and Rifle Clubs), as defined by the Defence Act of the time.

Anyway, there is a "note" in big, bold text that states:

FOR ALL REPLACEMENT BARRELS, POINT 'A' MUST BE RETARDED BETWEEN 1O DEG AND 15DEG TO COMPENSATE FOR BODY DEFORMATION.

The datum (point "A"), for the breech-thread start is defined as follows:

A point on the breeching shoulder, 10deg, 8min above the horizontal, on the RHS of the shoulder and at the major diameter of the thread.

To whit:

Major Dia. 1.000 / 0.9937 " dia. CREST OF THREAD TO START AT "A".
FORM: WHITWORTH.

So, this is NOT a "service" barrel, but I doubt very much that its specifications, apart from the deletion of the bayonet lugs, would deviate far from anything produced in Canadaicon or Britainicon.

Has anyone ever seen a drawing (or a sample) for a "service" barrel with the provision for thread-start "variation" in Canada or the UK?