Hi Cody and welcome. Unfortunately, no Sir. Cheers and stay safe!

Cody Sir,
You've received a lot of NO answers, so what options do we have here? Aftermarket manufacturers like Storm Lake: Known for high-quality barrels, including threaded options for many pistols.
Zev Technologies, Agency Arms, or Bar-Sto: Some aftermarket companies produce threaded barrels compatible with the Shield 45 ACP, but compatibility and fit should be verified.
Unfortunately, Threaded barrels for the M&P Shield 45 ACP are somewhat less common than for other models like the M&P Shield 9mm or 9mm models. You can also research your local reputable gunsmith or custom shop to see.if they can thread your existing barrel or modify a compatible barrel.
Hope this helps Bud and please take care and stay safe. 🙏

Unfortunately, no!

No, they do not.

Good evening to you!! Unfortunately no. Bud's does not sell threaded barrels for the S&W M&P shield in 45 ACP. See below for more information. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'merica' 🇺🇸🇺🇸
https://faxonfirearms.com/handgun-parts/barrels/for-smith-wesson/

No, but there are a few available below.
TRUE Precision 3.1" M&P Shield Threaded 9mm Drop-In Barrel https://share.google/0NHbqddxTwLYDOrDs