Source for M&P RSA?

[revchuck38]

I'm specifically looking for an RSA for an M&P 45 mid-size (4" barrel), preferably factory. Neither Brownell's nor Midway list them. What other "usual suspects" should I check? What other options are out there?

ETA: Found one, Speed Shooter Specialties. Still interested in other options, though.

[Colt191145lover]

I used to buy parts from speed shooter specialties when I used the M&P series, highly recommended.

[ranger]

I have bought small parts from S&W. They sent me multiple M&P followers for free to replace ones with broken "legs". Springs of course are wear items.

[Wendell]

https://store.smith-wesson.com/parts-and-magazines/recoil-parts/mp45-compact-recoil-guide-rod-assembly/394140000.html

https://store.smith-wesson.com/parts-and-magazines/recoil-parts/