It is true that the M&Ps of the vintage you mention have very nice stock triggers. I have several that I consider off limits to any screwdriver. The J frame , however , is a different ball of wax. The action in that small frame is based on a coiled mainspring rather than the leaf spring found in the relatively spacious K grip frame. Also the rebound spring of the J frame sometimes seems excessive in strength. I tend to think that the designer(s) was thinking SAFETY in determining the da trigger pull weight. Generally speaking , I think it is easier to achieve good trigger characteristics in a larger frame than in a bitty J frame.
In my experience many J frames , even older ones , have definite room for improvement in the actions , and the before gunsmith and after gunsmith trigger difference can be striking. ( I said many , not all ; there seems to be considerable difference between various individual J frames of the same vintage , for reasons that are over my head.)
Fact is , I have a flath latch Chiefs Specieal that will be shipping out soon for improvement for the fore mentioned reasons.
