This is a Jewell Model 70 trigger.
It is not much different than the Tubb, Shilen, Timney or others.
In my experience, depending on the gun, most competition triggers are like this.
I see no problem. Most of my competition triggers are set for 2-3oz. My hunting triggers are set for 2lbs.
I have never had any problems with build up in a trigger mechanism.
That Jewell trigger will adjust from 1 1/2oz to 4lbs, it costs over $200 at Sinclair.
The new Winchester trigger goes down to 3lbs, which is just fine for a hunting rifle.
Pete
