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Drm50 · February 7, 2019, 03:41 PM

People tend to use strain screw to adjust trigger pull. It's suppose to be all the way in. You can buy spring sets for lighter pull but strain screw still goes in all the way. I bought a 19-2, that I still have. It had spring kit in it for light SA trigger pull. Gun shot well and one day it
started opening up the group. Thinking I needed to scrub the barrel I did. Then it started to
misfire from light strikes. I decided it was the aftermarket spring. Put original back in which I got with gun, same thing. Then I found the first 150 rds fired were Win primers. The batch I had been using since problems were CCI. Turn out a lot of guys were having light strike misfires with CCI 500 & 550 primers. Except in SAs they worked fine. The light strikes on those hard primers (550s) was causing UN uniform ignition and opening up groups. I wouldn't have noticed but was shooting rested with scope.

February 7, 2019, 03:41 PM	#7
Drm50 Senior Member Join Date: November 10, 2014 Posts: 1,378	People tend to use strain screw to adjust trigger pull. It's suppose to be all the way in. You can buy spring sets for lighter pull but strain screw still goes in all the way. I bought a 19-2, that I still have. It had spring kit in it for light SA trigger pull. Gun shot well and one day it started opening up the group. Thinking I needed to scrub the barrel I did. Then it started to misfire from light strikes. I decided it was the aftermarket spring. Put original back in which I got with gun, same thing. Then I found the first 150 rds fired were Win primers. The batch I had been using since problems were CCI. Turn out a lot of guys were having light strike misfires with CCI 500 & 550 primers. Except in SAs they worked fine. The light strikes on those hard primers (550s) was causing UN uniform ignition and opening up groups. I wouldn't have noticed but was shooting rested with scope.