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The prototype illustrated appears to be mounted on a modified X8E2 (Ex2) unit sight top cover.
https://www.forgottenweapons.com/x8e1-x8e2-slr-manual/
The extended scope base, addition of the...

If you compare a x8 or ex1 to a c1 or l1, the extra (close to 4") length difference is noticable.

The Australian L1A1a or the metric "combo" device is much superior from a useability level - I...