[jobyt]

I was wondering what if any parts are interchangeable between the two models.I've noticed that there are parts available for the 400 from a couple of sources,but very little for the 600.Mostly curios about hammer,sear,extractor and firing pin. Joby

 

[garfield]

I haven't checked but some of the small parts that you mentioned should work, as should the pins, grip screws, etc.

 

[MGMike]

Only way to tell for sure is to try. You might be surprised...but then maybe not.

M