Sear Spring Mod.
The sear spring is accessable under the right grip panel.The sear spring has a large affect on the trigger weight and the pistol's accuracy. To remove or replace the sear spring it is preferable to have the pistol unloaded, empty of gas, and the hammer cocked. If you have used silicone adhesive to secure the panel it may be necessary to force the panel off. However, it is not necessary to clean the adhesive off and reapply it for it to continue to stabilize the panel.
Above are 3 versions of the factory sear spring. The left is the full length spring that produces a 3.75 pound trigger weight. The center spring has just the closing loop cut off and produces a 2 pound trigger weight. The spring on the right has the loop and 1/2 a coil cut off and produces a 1 pound trigger weight when installed with a #10 washer or 2 under it. Remember to install any cut spring with the cut edge down on the trigger frame.
I did some target testing with the 1 pound sear spring setup and found better than a 30% decrease in group size. I first discharged 10 shots to level off the gas. Then using RWS domed 14gr pellets at 10 meters off a bench rest and 7 meters freehand I took 10 shots off the bench and 10 shots freehand with the factory spring. I then changed to the 1 pound spring and washer and started the same process with a fresh caplet. Given that I am not much of a marksman I measured the Extreme Spread of the 10 shot, 8 out of 10, and 5 out of 10 to derive an averaged spread number. Off the bench I had a 37% smaller averaged group and freehand a 10% smaller averaged group using the lighter weight spring. However both bench and freehand best 5 of 10 shots showed over a 30% decrease in group size with the lighter weight spring.
If you are reluctant to cut the spring another option is to compress the spring around 50% of its length by tightening it with something like a 1/4-20 nut and bolt for a few hours. This will also reduce trigger pull weight. I have not experimented with this method and results will vary by the amount of compression and the amount of time compressed. Either of these methods are intended for people who do not have access to buying a comparably sized spring with a thinner wire gauge.
WARNING Always cut springs a 1/4 coil at a time and test the sear after each cut. The point at which the sear will not hold the striker is the point you need to start adding washers for preload. This is intended for factory sear springs only.
Shoot Smart. Shoot Safely.
Poorman Plinker
