Do you have means to precisely measure the inside diameter of your bushing? If it measures out to around 5/8" or 0.625" then I would surmise that the gun was inadvertently assembled with a short barrel bushing ie 4013 or 4516. The bulge at the muzzle on the short barrels measures around 0.624" whereas on the longer barrels, 4.25 and 5 inch, that bulge is around 0.590"

While the bushings for the compact and fullsize guns have different IDs the OD is the same so it's no too much of a stretch to imagine a compact bushing wound up in the wrong parts bin and was installed on a fullsize gun.

The bushings have a 'barb' of sorts akin to a hose barb that bites into the slide interior when pressed in. Removing a bushing might be accomplished with a miniature bearing puller or it may have to be cut out.

I agree with those above that you should contact S&W Customer Service and see about initiating a warranty claim. If indeed the gun was assembled with the wrong bushing and that got by QC, then that's on S&W to fix on their dime.

Cheers
Bill

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Because they don't make a .46