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Presuming a Beretta A300? I don't own one but was curious so I did some searching. Apparently it is reversible from what I've read, but Beretta recommends a gunsmith perform the job. Another person reported Beretta said it was the same as the A400 and sent them those instructions to follow.
I found a couple links that looked like downloads for the A400 procedure, but it's the internet so I won't post a direct link to a download here. If you contact customer service, perhaps they can supply a link to utilize. Regardless, if you aren't comfortable taking it apart, probably best to take it to a gunsmith. This is the safety on your shotgun we're discussing, so you really don't want to mess it up if you're unsure. Personally, I'd probably take it slow, stay organized, and not force anything as long as I had the proper tools.
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