P320 Adjustable Straight Trigger

(4 customer reviews)


The Grayguns P320 Adjustable Straight Trigger is the ultimate fire control refinement for this amazingly versatile platform, embodying the best innovations from Bruce Gray’s continuing R&D program with SIG Sauer®. Like all Grayguns premium aftermarket products, these triggers are proudly American made from precision machined tool steel, heat treated, hand finished and gauged for perfect appearance, fit and function.

Designed for hard duty use, with the toughness to outlast your pistol, our P320 triggers are Grayguns Grade and guaranteed for life.

  • Adjustable over-travel eliminates gross movement after the sear is released, and reduces trigger travel to reset
  • Enhanced Leverage geometry reduces pull weight by 30% with stock springs
  • Smoother takeup, sear release and reset sensation
  • Optimal 90⁰ sear release
  • Supports Voluntary Upgrade rough handling characteristics for assurance and reliability

Buy it once: Perfect fit, finish and function guaranteed for the life of your pistol.

Available in standard black oxide, Titanium nitride (TiN) Gold, Nickel PTFE, Physical Vapor Deposition (PVD) Blue or PVD Coyote finish.

SKU: N/A Category: Tag:



Black Oxide

  • Standard blued finish

Titanium Nitride (TiN)

A well-proven standard layer type through its balanced properties. The golden titanium nitride layer, abbreviated TiN, indicates the following properties:

  • High hardness and adhesion
  • Good chemical resistance
  • Good temperature resistance in air
  • Relatively low thermal conductivity
  • Attractive, golden color

Physical Vapor Deposition (PVD)

This state-of-the-art process creates a molecular bond to the trigger, resulting in a very durable finish. The PVD finish should not corrode, discolor or tarnish.

Nickel PTFE
Electroless Nickel PTFE (Teflon®) is an advanced, self-lubricating, composite coating that has PTFE particles co-deposited in the electroless nickel layer. Provides for a hard, uniform, self-lubricating coating for our premium aftermarket triggers.

Fit Guide

Fits all variations within the P320 (upgraded) system. Including all sizes, TACOPS Carry, X-VTAC, X-Carry, X-Five, Legion and RX versions.


These parts are intended for installation by a qualified armourer or gunsmith. In some cases professional fitting will be required by a trained, qualified armorer/gunsmith who is very familiar with the pistol’s action. This is due to the varying tolerances present in all mass-produced firearms. Although kits fit with no issues in a great majority of pistols, Grayguns is unable to guarantee perfect functionality in every instance. Grayguns does offer installation services for all parts kits we offer.

Additional information

Weight N/A
Dimensions N/A

Black Oxide, TiN Gold, PVD Blue, PVD Coyote, Nickel

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5 out of 5 stars

4 reviews

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What others are saying

  1. Larry Dagley


    Larry Dagley (verified owner)

    The title says it all…………. AWESOME!!!

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  2. tim4

    Great Improvement

    tim4 (verified owner)

    The Sig P320 curved trigger isn’t bad, but my finger kept getting rubbed a little raw with multiple firings. I had already put the Gray Guns flat trigger on my Sig P365 and loved it so I tried it on the P320. I was afraid it might increase the pull, but it did not. It is an improvement in every way for me. Better feel, better length of pull, and it is adjustable. Plus no more irritation of my trigger finger. Great step up IMO.

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  3. One person found this helpful
    Gregory Dillard

    Better than SIG Custom FCU

    Gregory Dillard (verified owner)

    So I spent the big bucks for the SIG P320 FCU from their custom shop. Purchased the GrayGuns P320 Adjustable Straight Trigger and honestly the trigger pull and reset is better 3.8 lbs vs 4.1 lbs with the GrayGuns trigger for less than 1/4th the price!!

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  4. 3 out of 3 people found this helpful

    Custom Trigger for my Sig M18 - much lighter than factory!

    steveoglesby (verified owner)

    My M18 had a decent pull from the factory. I just installed this trigger (I’m not a gunsmith), and the pull is noticeably lighter. And after adjusting the overtravel, it feels even better. This might be the only custom trigger currently available for the M17/M18., and it’s well worth the price.

    (3) (0)

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