ww1 s&w .38spcl parts?

[Marlin 45 carbine]

can anyone steer me to a supplier of?
I need a mainspring for an early m&p, it's in decent shape otherwise and would do for wifey last-ditch gun to shoot if shtf loaded lightly w/125gr cast rn
fella says it was his granddads - he raised him after folks died in car accident.

 

[Steve Danielewicz]

Model 10? if so..http://www.gunpartscorp.com/catalog/Products.aspx?catid=10016

 

[rcmodel]

Any K-Frame mainspring ever made should fit it.

Even a brand new 2012 one from Wolff, Brownell's, or S&W.

rc