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The Armory

// 04 Armory · sig

SIG Sauer

Striker-fired

Modular P320 platform — the serialized fire-control unit drops into different grip modules and slides.

Models covered

  • P320 X-Five

    Long-slide competition P320 with optic cut and magwell-equipped grip module.

  • P320 AXG

    Metal (alloy) grip-module P320 — extra weight low in the hand.

Component
Symptom / goal

Troubleshooting matrix

Tap a cell to filter

Guide count by component (rows) and symptom or goal (columns)
ComponentMuzzle riseDot trackingLighter triggerFaster resetFailure to ejectFailure to feedReliabilityFaster reloads
Recoil system
Guide rod / weight
Trigger
Magwell / grip
Optics

05 / 5 guides

  • Recoil systemDrop-in

    Recoil spring weight & ejection

    Dot dips on return, weak ejection with soft loads, or the slide fails to lock back.

    Muzzle riseFailure to feedFailure to eject
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    Applies to · All models

    Recommended parts

    PartSpecWhy
    Aftermarket guide rod with interchangeable springs—Tune spring weight independently of the factory captive assembly.
    Lighter or heavier recoil springMove 1–2 lb at a time; tune with your loadMatch slide energy to your load.

    Installation notes

    1. 01Unload, verify clear, field strip.
    2. 02Install the spring and rod per the maker's orientation.
    3. 03Run 50+ rounds per weight; film the dot and watch ejection.
    4. 04Confirm slide lock with every magazine.
  • Guide rod / weightDrop-in

    Tungsten guide rod

    Muzzle climbs between shots, especially in a polymer grip module.

    Muzzle riseDot tracking
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    Applies to · All models

    Recommended parts

    PartSpecWhy
    Tungsten guide rod—Adds mass forward and low to resist rise.
    Re-tuned recoil spring—Extra mass changes cycling; re-test spring weight.

    Installation notes

    1. 01Match the rod to your slide length (full-size vs X-Five length).
    2. 02Field strip, install, hand-cycle to check for binding.
    3. 03Re-test recoil spring weight with your load.

    Caution · Check total weight against your division's limit.

  • Magwell / gripDrop-in

    Grip module & magwell

    Grip feels too light or the wrong size; reloads miss the mag well.

    Faster reloadsMuzzle rise
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    Applies to · All models

    Recommended parts

    PartSpecWhy
    Metal (alloy) grip module—Adds weight low in the hand to flatten recoil.
    Grip module with integrated or add-on magwell—Faster, more forgiving reloads.
    Correct-size module for your hand—A consistent grip matters more than any spring.

    Installation notes

    1. 01Unload, verify clear, field strip, and remove the takedown lever.
    2. 02Lift the fire control unit (FCU) out of the old module and seat it fully in the new one.
    3. 03Reinstall the takedown lever, reassemble, and function-check trigger, reset and slide catch.

    Caution · Confirm module and magwell legality and weight for your division.

  • TriggerArmorer

    Flat trigger shoe & trigger group

    Curved shoe causes inconsistent placement; pre-travel feels long.

    Lighter triggerFaster reset
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    Applies to · All models

    Recommended parts

    PartSpecWhy
    Flat-face aftermarket trigger shoe or factory flat trigger—Consistent placement and better leverage.
    Polished (not reshaped) contact surfaces—Removes grit without changing engagement.

    Installation notes

    1. 01Trigger work happens inside the FCU — follow the parts maker's instructions exactly.
    2. 02Confirm all internal safeties function after assembly.
    3. 03Function check: trigger, reset, and that the striker won't release with the trigger untouched when the slide is cycled.

    Caution · Do not alter sear or striker-engagement surfaces. Check SIG's current safety notices and upgrade programs for your FCU before modifying it.

  • OpticsDrop-in

    Optic plate & mounting

    Optic shifts zero or loosens after a few sessions.

    Dot trackingReliability
    Toggle details

    Applies to · All models

    Recommended parts

    PartSpecWhy
    Plate matched to your optic footprint—Correct fit removes play.
    Correct-length optic screws—Overlong screws can contact the striker channel.

    Installation notes

    1. 01Degrease threads; use the thread locker your optic maker specifies.
    2. 02Torque to the optic manufacturer's spec.
    3. 03Witness-mark screws and re-check after the first 200 rounds.