I have several of the Remington 500 series .22rf rifles. Up to now they have all had good smooth triggers. Over the years whenever I had one detail disassembled I'd smooth any burr (very gently) or any uneven surface on the contact surface (see diagram). I'd also polish the recess in the trigger for the trigger return spring + the trigger return spring plunger.
After re-blueing a 510 recently I found the sear surface to be OK & reassembled the rifle with the normal trigger spring/plunger/recess polishing..
The completed rifle now has a heavy trigger: no creep, just heavy. It took every trigger weight I have (5 3/4 lbs.) to trip it & there was a slight hesitation when I put the last 1/4 lb. weight.
Questions:
1. Does the torque on the rear left side screw that also secures the rear of the extractor have any effect on trigger pull?
2. Does the torque on the front screw to the extractor effect trigger pull (I'm desperate)?
3. Would a minor reduction (very minor) + extra polish on the sear contact surface to the firing pin help or hurt?
4. On most other trigger mechanisms a reduction in the main spring reduces the pull. Would that help on the 510 trigger? I'm thinking about 1/2-1 coil (no more than 1 coil).
I know some members are experts on these rifles & I'd appreciate any help.