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Measured P320 trigger pull

This is a discussion on Measured P320 trigger pull within the P250 & P320 Modular Pistols forums, part of the SIG Sauer Pistols category; I am curious if anyone else has measured their P320 trigger pull weight. I just measured mine using a Lyman digital gauge and am at ...


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P250 & P320 Modular Pistols P250, P320, and Exchange kits

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Old 06-27-2016, 01:28 PM   #1
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Measured P320 trigger pull

I am curious if anyone else has measured their P320 trigger pull weight.

I just measured mine using a Lyman digital gauge and am at around 7.5 lbs. i.e., a heck of a lot less than the DA pull on my hammer-fired Sigs (11 lbs), but a heck of a lot more than their SA pull (~4 lbs).

Anyone else measure it? I understand you can swap parts and lower it, but I doubt I will since my P320 is a carry piece. Just curious how much variance there is.
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Old 06-27-2016, 02:17 PM   #2
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That seems heavy. Did you test it multiple times? Russ
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Old 06-27-2016, 02:34 PM   #3
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Evening scuba;

My last 320 (early 2016 build) came as new at a measured (av of 10 pulls) at just under 8#.

I put about 500 rounds through it then re-measured & it dropped to 7.25# (av 10 pulls).

I did a little work on the trigger bar (it was dragging on the edge of the module) & polished the drop safety as it was very crunchy feeling (slight help) then replaced the drop safety flag due to the still crunchy draggy feeling trigger (that didn't lower it a whole lot but sure smoothed the trigger pre-pull.

Then I re-contoured the trigger return spring slightly to reduce it's tension (didn't seem to really effect trigger reset).

I'm at a little over 1000 rounds now & it has settled it to 5.25# (10 pulls av) with a very smooth pre-pull & just a little creep in the short pull-through.

Not as good as either of Walther PPQ's but good enough for a defense gun (at least it is shootable now)
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Last edited by mildot; 06-27-2016 at 02:36 PM.
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Old 06-27-2016, 02:34 PM   #4
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Quote:
Originally Posted by Bluefish View Post
That seems heavy. Did you test it multiple times? Russ
Yep. Depends on where you hook the trigger bow for a pinned/hinged bow, but that is the reading at the center of the bow pulled straight back. It's tougher to hook low and approximate someone pulling at the bottom of the bow.

I'm not sweating the ounces, since I didn't spend a lot of time getting a set of ten stored readings to get an average, but it's clear to me that mine is in the 7+ lb range. Sig's specs claim "5.5 - 7.5 lbs". Not sure if they are claiming that much variance or that's what is possible based on adjustment/parts swaps.
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Old 06-27-2016, 02:42 PM   #5
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To add to what Bluefish asks:

It's also important to place the pull gauge hook at the center of the trigger and make sure the hook rod is parallel with the slide or barrel, pulling straight back.

With trigger that pivot at their top, placing the hook higher on the trigger or pulling at an upward angle will increase trigger pull readings. Hooking lower on the trigger will tend to decrease readings.

Pull smoothly and slowly.

Edit, oops, msg crossed, mostly answered :c)
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Old 06-27-2016, 02:45 PM   #6
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Quote:
Originally Posted by bumper View Post
To add to what Bluefish asks:

It's also important to place the pull gauge hook at the center of the trigger and make sure the hook rod is parallel with the slide or barrel, pulling straight back.

With trigger that pivot at their top, placing the hook higher on the trigger or pulling at an upward angle will increase trigger pull readings. Hooking lower on the trigger will tend to decrease readings.

Pull smoothly and slowly.

Yep, those are the readings at the center of the bow, pulled straight back very slowly, with the initial position just in front of the bow (not touching). It's a pretty high quality gauge that I have used on a number of other triggers whose weights I know, so I am fairly confident in the readings.

Just really surprised that Sig quotes such a wide range on their site....and was curious if anyone got one from the factory with a significantly lighter pull.

For a piece without a decocker, it's good enough for me, but I'll admit I am a lot more accurate with my DA/SA sigs in SA mode.
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Old 06-27-2016, 02:48 PM   #7
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Out of curiosity, how many rounds are through it?

The first P320 I ever dry-fired was a compact .40; it had the best trigger I've ever felt on a striker-fired pistol. It had been sitting in the display for months and months, and had been dry-fired a TON of times by curious customers and employees. The next couple of times I dry-fired P320's, they were brand spankin' new 9's (that didn't last long in the display), and their triggers were not nearly as crisp as that first .40.

Further, I think a lot of magic can be performed on the P320's with stock parts; you could probably reduce the pull just by polishing all the right surfaces. TheSigArmorer (Robert Burke) is pretty well known for his work on SIG triggers. Here is a quote from his FAQ: "The Sig Armorerís Trigger Jobs always utilize factory power springs to ensure proper primer ignition every time."
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Old 06-27-2016, 03:00 PM   #8
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Out of curiosity, how many rounds are through it?

The first P320 I ever dry-fired was a compact .40; it had the best trigger I've ever felt on a striker-fired pistol. It had been sitting in the display for months and months, and had been dry-fired a TON of times by curious customers and employees. The next couple of times I dry-fired P320's, they were brand spankin' new 9's (that didn't last long in the display), and their triggers were not nearly as crisp as that first .40.

Further, I think a lot of magic can be performed on the P320's with stock parts; you could probably reduce the pull just by polishing all the right surfaces. TheSigArmorer (Robert Burke) is pretty well known for his work on SIG triggers. Here is a quote from his FAQ: "The Sig Armorerís Trigger Jobs always utilize factory power springs to ensure proper primer ignition every time."

About 200, so she is still fairly new.
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Old 06-27-2016, 03:03 PM   #9
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Agree on the gauge, I've checked my Lyman digital against known weights and it's spot on.

Other things that I find can skew the reading a little (typically raising them) is when I mount a gun in a vise and take a reading it'll typically be a little lower and more consistent than when holding the gun in one hand and pulling the gauge with the other (freehand). If I rest the gun, pushing it into or on a padded bench and pull the gauge back, making sure to keep the gun steady, it will replicate the readings as with the vise mounted gun.

This may have to do with the jerk (doing the test?:c) or flexure that occurs when the sear releases, the additional motion of the hands, coupled with the "shut off or take the reading" point on the gauge, I'm not sure. So at the least, I steady the gun on the bench while taking readings.
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