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Hi Cody and welcome. I would check with Smith and Wesson at 1-800-331-0852 Monday-Friday 8:00AM-4:45PM EST or by online inquiry here: - https://www.smith-wesson.com/customer-service/contact-us - since the Shield should be compatible with the Shield plus barrel and this model is available with threaded barrel: https://www.smith-wesson.com/product/mp9-shield-plus-with-threaded-barrel

Lone Wolf makes an aftermarket threaded barrel for this.

I'd try to call Smith and Wesson at 1-800-331-0852 Monday-Friday 8:00AM-4:45PM EST for help on this.