sd9

[Scorp1911]

will an m&p 9mm barrel fit an sd9? Any aftermarket support yet or will there be?

 

[OKFC05]

will an m&p 9mm barrel fit an sd9? Any aftermarket support yet or will there be?

No, M&P parts don't fit.
What problems are you trying to solve, and what aftermarket items do you want?
The SD is an improved Sigma, not an M&P twin.
Apex has a spring kit, there are some few night sights and lasers, slip-on grips, lights, etc.

 

[Scorp1911]

i was wanting to try a threaded barrel for the extra barrel length