Back action lock heavy trigger pull

[varsity07840]

Any suggestions on how to lighten up the trigger pull on a single trigger rifle with a back action lock?

[Bob Roller]

Can you post a picture closeup of the mechanism??
Bob Roller

[smylee grouch]

Trigger placement on the sear can affect the weight of trigger pull and too heavy a sear spring can also cause problems. Food for thought. 

[Bob Roller]

A bone dry mechanism or a too deep full cock and a stiff mainspring can also contribute to this  condition.
Bob Roller

[varsity07840]

Can you post a picture closeup of the mechanism??
Bob Roller

It's a lock from a percussion carbine loaded from the wrong end. I probably shouldn't have broached the subject here.

[Bob Roller]

If it wasn't for the muzzle loader the others could/would  not have been needed.
Bob Roller

[D. Taylor Sapergia]

I think you could post a picture of the inside close-up of the lock.  I suspect that the full cock notch is filed a little too deep and perhaps at an angle that is conducive to heavy pull.  Does the lock have a detent?