SIG Sauer P320 Trigger Review: SIG Factory Flat Trigger

In my first P320 flat trigger review (viewable here) I put the Apex Advanced up against the Grayguns PELT.  I specifically didn’t include the SIG factory trigger since both the Apex and Grayguns were designed to reduce the pull weight.  I wanted to keep everything on an even level.


SIG Sauer P320 Flat Trigger


Per SIG’s website:

The SIG SAUER P320 factory flat trigger is a direct replacement to your stock trigger. The flat trigger design gives shooters a lower position on the trigger, which will increase leverage for a smoother, more consistent pull.


The Data

First up are the numbers and then I’ll give my personal opinion on the feel.  My testing protocol is to measure and record each combination and then fully repeat the process all over again.  This means removing and reinstalling each part.  It’s tedious but provides the most accurate results.

Stock Curved Trigger
Weight: 6 pounds 8 ounces
Reach: 2.71″
Pre-travel: 0.11″
Width: 0.37″

SIG P320 Flat Trigger
Weight: 4 pounds 10 ounces
Reach: 2.80″
Pre-travel: 0.11″
Width: 0.366″


The flat trigger isn’t designed to lower the trigger pull weight, so why did it?  When measuring the pull with a flat trigger I measure from the bottom of the trigger.  This is where leverage is greatest, so the weight is the lightest.  With a traditional curved trigger I measure from the center.  Since the leverage is less the weight is higher.  While not “apples to apples” it provides the most reliable and consistent data.


The Feel

The trigger feels excellent.  While not exactly the same as my P226 Legion SAO it is very similar.  As far as pre-travel, creep, reset, etc., the SIG, Apex, and Grayguns triggers are nearly identical.  I can find no meaningful difference between them.


Comparison of SIG, Apex, and Grayguns

In my previous review I thought Apex was the best value but I liked the feel of the Grayguns better.  After testing the SIG factory trigger I see no reason for the Apex or Grayguns.  From a value perspective both the Apex and SIG trigger cost the same, with Grayguns coming in at twice the price.

From a feel perspective Grayguns and SIG are very similar.  The Grayguns trigger has a slightly more rounded trigger face edge but the only way you would really notice is if you have small hands/short fingers.  Overall I think it’s a moot point though.  If you have small hands why would you be using a trigger that increases the reach by 0.10″?  The other factor is the weight, using the stock spring the Grayguns trigger is only 9 ounces lighter than the SIG trigger.  9 ounces, to me at least, isn’t worth a 100% price increase.

Give the recent drop safety fiasco and SIG’s recall, excuse me, “voluntary upgrade”, this may not mean much in the end.  We don’t know how the “upgrade” will play with the SIG flat trigger yet.  Apex has issued a statement saying they were suspending sales and offering a store credit refund for all their P320 triggers, even though the flat triggers in testing weren’t discharging when dropped.  Grayguns posted a statement that read as more of a legal proclamation about how they aren’t liable if you drop your gun and get shot.  Also in contrast Grayguns continues to sell their triggers.

Apex seems to be much more concerned about the safety of their customer’s than they are about sales.  Good on you for stepping up, Apex!


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