I’ve been toying with the idea of making my 1.0 Shield into a “long slide”, but have been stymied by the lack of 4” barrels in any flavor.
If you find what you are looking for I’d be interested in taking the OEM off your hands.
Good luck!
The M&P9C barrels will not fit.
I believe the Shield barrels will fit the Shield plus but someone else will have to confirm.
Only in black but here's the ported 4" Shield barrel in 9mm in stock.
4" 9mm M&P Performance Center Ported Shield Replacement Barrel
Yes, Shield barrels will work in Shield Plus; the upper is the same, only the lower has been changed to accommodate the larger magazine.
Ported doesn’t help me, but thanks for posting the link.