question on trigger reset

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question on trigger reset

Post by Aprilian on Sat Jun 11, 2016 8:17 pm

I read (it might have been on Encyclopedia of Bullseye) that after a shot you should hold the trigger, let the slide cycle and then release/reset the trigger as you came back onto target from recoil.   

I have been experimenting with this during my dry fire exercises - using a Buck Mark .22.   I have noticed that  the pull on the trigger is easier and feels shorter when I manually cock the pistol while holding the trigger (vs. releasing the trigger first).   I don't have a trigger scale, so I can't quantify the difference. 

What might be happening with the disconnector, sear and hammer that would change the trigger pull in this manner?

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Re: question on trigger reset

Post by jmdavis on Sat Jun 11, 2016 8:33 pm

You already have pressure on the trigger so after reset it breaks with less weight. If you release all the way the pull should be the same.

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Re: question on trigger reset

Post by Aprilian on Sat Jun 11, 2016 8:52 pm

but I do release it all the way.  I even did reset the sear (holding the trigger), put the gun down and picked it up - it still was an easier pull.   I can't build a hypothesis of what is happening.   The only odd thing I have noticed was that the slide has some wear where the disconnector sits.  It looks like a slight groove, but again, I can't figure out the way that would impact the trigger pull.

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Re: question on trigger reset

Post by Jon Eulette on Sat Jun 11, 2016 10:34 pm

jmdavis wrote:You already have pressure on the trigger so after reset it breaks with less weight. If you release all the way the pull should be the same.

Sorry but I disagree with your post/statement. When the trigger resets it requires moving trigger forward enough for the disconnector to move up and engage the sear for the next shot. The trigger take up has negligible weight that applies to the total trigger weight.
I believe there are physiological things taking place that during firing a 5 shot string that make shots 2-5 easier than the 1st shot. Also some pistols will have slightly different pulls based on actual sear/hammer geometry or lack of really good trigger job; so inconsistent pull.
In some cases hard to prove or measure but feels that way.
Jon

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Re: question on trigger reset

Post by Aprilian on Sun Jun 12, 2016 8:05 pm

I built a trigger gauge, locked the gun in a padded vice and sure enough, even though the pull was not consistent pull-to-pull, it did not significantly differ between the two styles of reset.

However, later with the slide off, I could reset both ways and I can see what is happening.   The sear pivot is slightly loose in the frame on the disconnector side and the first part of the trigger pull lets the sear twist before the sear rotates on its pivot.  It somehow needs to twist less (before pivoting on the sear pin) when cycling with the trigger held in the fired position.

I'll get a new sear, sear pin and safety click plate to see if I can tighten the action slightly, but it might just be a design limitation of the Buck Mark where they leave large clearances to allow it to run dirty.


Last edited by Aprilian on Sun Jun 12, 2016 8:17 pm; edited 2 times in total (Reason for editing : clarified)

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Re: question on trigger reset

Post by Aprilian on Thu Jun 16, 2016 7:43 pm

Interestingly the newer design of the sear pin is longer! It also now has a chamfer on the shoulder. The new sear fits tighter on the new pin too,  I think those two pieces will reduce/eliminate the twist.   I'm doing a 2700 on Saturday, so the modification will be later.

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