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I was on a Saber FB group and saw someone had attached several “Yari Pike Extensions” to their saber. Would this approvable if properly painted?

Weapons are not a required part of approval. There are many versions that are made to replicate. Depends how close you want to represent.

As Lucious says, weapons are not required for approval (unless you're from the UK).

However to troop with a weapon it should match the references in the CRL. Yari Pike extensions on a saber do not match visual references, however, ultimately it will come down to your Garrisons GML and/or Command Staff what they allow their members to troop with.