British Army 7.62 mm L1A1 Boresighting Device

[nzl1a1collector]

Thanks for the replies guys, I will make a note of the latter 'corrected' method of boresighting with the .22 Conversion Kit barrel. Was the boresighting chart still used with the new method or was something else used?

While were looking at some unusual training aids, here's another that I'm looking for the 'bracket' for.

Information

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[tankhunter]

I assume that this is in .22" for mounting on the exterior of an Anti-Tank Gun. Or Tank main Armament. For interior 30 Mtr Range practice?