On the Bren blank barrel with the heavy threaded screw on restrictor, what is the thread pitch ? (See picture)

I have bought 3 of the solid restrictors which are internally threaded and I was planning to get some shot out Mk II barrels and tap the ends so that the restrictors can be used with the blue wooden bulleted L10z blanks that we have here.

I don't have a Britishicon thread gauge so its a bit tough to tell exactly what they were using. It looks pretty fine to me, so I'd hazard a guess it was BSF , but I can't be certain.

Anyone with information, please drop me a line.


Gary
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