Does anyone have on hand the correct size or spec for Bren / L4 gas block pins?

The pin hole in the barrel is still under sized and the pins we sourced are dropping halfway through.

Looks like I will need to source some locally, so it would be good to know the size/taper I am looking for... Attachment 84307

Other than that, the L4 barrels are going very well and are almost done.
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