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SCHOOL ME: Rem. 500 series (510) trigger
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.
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THE PLOT THICKENS: some success
I disassembled the bolt from my #2 511 (I don't mess with #1) and found the cause of the heavy trigger pull. Take a look at the attached photo & you'll see big time differences in the firing pin springs. Although the 510 spring is shorter, it is also constructed of heavier gage wire. In short, it is not nearly as flexible as the 511 spring. Furthermore, the thick gage clamps down on the spring guide (the rear of the guide protrudes @ the rear of the "beehive" when cocked). This clamping action made the last coil of the 510 spring useless. I had to pry the spring from the guide with a small screwdriver to separate them.
I installed the 511 spring on the 510 bolt (I'll order another for the 511). The trigger will lift a 4.25 lb. weight, but trips (quickly) with a 4.50 lb. weight. This is a 1.25 lb. improvement over the 510 spring & a .50 lb. over this same spring in the #2 511.
I think I'll shoot the gun as is for a while to see if wearing-in improves everything even more.
Many thanks to everyone that joined in to help me solve this problem.
Schutzen-jager, I'll file away the information that you furnished because I'll probably be accumulating more of this series of rifles.