FITSC Rules
https://www.fitasc.com/upload/images/Rglts_PCH_01012017_ENG.pdf

7.2 Other shooters’ guns must not be touched without their permission.

Penalties
13.2 For a first breach of an article of the rules, the referee or jury will issue a warning.
That's it.

NSCA Rules
http://nsca.nssa-nsca.org/wp-content/uploads/sites/7/2021/03/2021-NSCA-Rule-Book.pdf

II Safety and IV Rules of Conduct did not mention handling another competitors gun without permission.


I agree this was either stunning lack of awareness or intentional.

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