[Victor]

I live in NJ...

So what am I supposed to do with all of my Beretta 92 mags that hold 15 rounds?

I don't think Beretta makes a modification nor do they sell 10 round mags for this gun.

Can I legally still go to my range with my 15 round mags loaded with only 10 rounds...?

Probably not.

[Psalm 73]

"So what am I supposed to do with all of my Beretta 92 mags that hold 15 rounds?"

Turn them in. You won't be needing them anymore. The state will protect you. Trust them.

[Blue Jays]

"...Can I legally still go to my range with 15-round mags loaded with only 10 cartridges..."

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From what I have seen of the law written in your state, doing that would make you a felon.
Simply owning those 15-round magazines...sitting empty on a shelf in your basement...makes you a felon.
Penalties include a mandatory and non-negotiable prison sentence for possession of a magazine greater than 10 rounds. Be very careful.

[Ancesthntr]

“So what am I supposed to do with all of my Beretta 92 mags that hold 15 rounds?”

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Get a note from your doctor, explaining that you identify as a retired (woman) police officer.

[SirFishalot]

Seal them in a box addressed to a friend living in a State where they are legal. Next, apply US postage stamps on the box and place it on your shelf. Now they need a federal warrant to open the box.

[Sacajaweau]

Almost every law has exceptions. Maybe it’s in there someplace.

[Sacajaweau]

10 round mags for the Beretta 92 all over the place.

[ScottfromNJ]

“I live in NJ...
So what am I supposed to do with all of my Beretta 92 mags that hold 15 rounds? I don’t think Beretta makes a modification nor do they sell 10 round mags for this gun.”

This site has a guide posted right on its homepage in regards to the new law.

https://www.anjrpc.org

[vigilence]

Yes, you can buy 10 round mags for the Beretta 92. I live in California and mine came with two 10 rounders. But if an intruder has an outlaw high capacity weapon why can’t I have access to high capacity magazines to protect myself and my family? And the larger, unspoken, threat of despotic government forces that a free man may be forced to confront? Which is what the Second Amendment is actually about.