How can you measure trigger pull?

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odk

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How can you measure trigger pull, in pounds? Or can you?
Could you hold the gun vertically then add weight to the trigger until it fires? Or do you have to have it measured with a piece of equipment?
I've done the JP yellow spring modification. How do I know if I'm "there" at 3.5#s?
Lots of questions. Hope someone has an answer.
 
Broke mans way of using a Milk jug, Hanger, water, and a digital bathroom scale. For best results you will need a scale used for lighter loads. Weigh something similar to weight desired, then get yourself some string! Also could use the weight of the gun. 5lbs unloaded. Stock Trigger pull 7lbs? To see if you've passed 5lb mark. Maybe with out Stock? lol.

Improvise or buy a trigger scale. Or fish scale. Good luck.
 
odk, the JP springs alone give 4 to 4.5 pounds. To get down to 3.5 pounds you have to put in additional JP goodies.
 
"odk, the JP springs alone give 4 to 4.5 pounds. To get down to 3.5 pounds you have to put in additional JP goodies."
by Halfswiss

Here is what I did. Hung the lower receiver from the ceiling. Filled a plastic container with 4#s of sand (measured on a digital scale, good to .00 oz. Attached container to trigger with electrical wire. See attached photo. Then I began adding sand until the trigger (released, fired). With three cycles I averaged
4lbs. 14.8oz. I thought it might be a little lighter than that.

halfswiss indicates more can be done. I did attempt to polish the sear surfaces, maybe not well enough.

This is probably a primative way to determine trigger pull, but I wonder if others are more in the range of 4.5 to 5.0 #s of trigger pull with the 3.5 JP springs? Thoughts?

8441504005_medium.jpg
 
Pretty good setup, but I would refrain from dry firing with the upper removed- the hammer striking the lower can cause undue wear and stress on the trigger components and frame.

Instead take a foam earplug (or just a piece of it) and close the bolt on it. It will absorb the energy transferred to the firing pin.

If the trigger is satisfactory then leave it alone! Don't go chasing a 3lb mark if you can't reliably and safely do so without compromising sear engagement.
 
odk, I think the angle of your test rig can result in a little higher reading than if you were actually pulling straight back on the trigger. I also echo Rustpot's comment about not letting the hammer hit full force on the lower. Too much of that can cause problems.

Here is the link to the JP spring kit manufacturer site for the specific spring kit. Note that it says 4 to 4.5 pounds. You need the JP trigger parts to get down to 3.5 pounds. Personally, I'm very happy with the JP springs and don't want to drop below 4 pounds on a recreational 22 that everyone in the family uses.
JP Rifles
 
Why not use a cheap digital fish scale? They are about $18.00 new at walmart.

31NJ5K92B8L._SL500_AA300_.jpg
 
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