I don't think a regular luger mag will work with a stainless; this is a Mitchel Arms or the like?
I think, but I am not positive that they take their own mag?
If that is what was said above (as i don't know) then a 2nd mag is good to try
If the trigger is catching, not sure how it would be the mag and the would be curious if there is a minor rough spot on either the trigger or the sear bar
I need to get one or borrow one and see how they are alike and different, I just know that parts are not interchangeable