SIG P320 Grip Module Guide

Standard vs. X-Series vs. TXG vs. AXG & Aftermarket

Polymer, tungsten-infused polymer, aluminum and aftermarket P320 grip modules—size, weight, ergonomics, manual-safety fitment, magazine length, magwells, basepads, dust-cover length and how grip-module mass changes the finished pistol.

Standard   |   X-Series   |   TXG   |   AXG   |   Aftermarket   |   Magwells   |   Fitment

The P320 grip module is a chassis around the serialized FCU—but it still changes how the pistol shoots.

A lightweight standard-polymer Compact grip and a weighted TXG competition module can use compatible P320 fire-control architecture while feeling like completely different pistols.

The shape changes how the hand reaches the trigger. The undercut changes how high the hand sits. The grip length changes magazine fit. Material changes mass and rigidity. Dust-cover length changes how the upper assembly sits over the frame.

Grip modules are modularity, ergonomics and recoil management all at once.

Same FCU. Very different pistol.

The standard module is the original P320-style polymer chassis.

Current SIG examples weigh roughly:

• Compact Medium: about 3.4 oz.
• Carry Small: about 3.4 oz.
• Full Medium: about 3.7 oz.

For a carry gun where low overall weight matters, that simplicity is still a legitimate advantage.

SIG offers multiple factory P320 polymer modules in Small, Medium and Large grip circumferences.

Unlike pistols using removable backstraps, the standard P320 polymer grip is a complete module. SIG's current specifications list no interchangeable backstrap or panel system.

If the trigger reach or circumference does not fit the shooter, changing the entire module is the adjustment.

The X-Series family changes the shooter interface without necessarily adding much weight.

SIG's X5 grip description highlights:

• Deeper trigger-guard undercut.
• Higher backstrap.
• Extended beavertail.
• A higher hand position intended to improve recoil management.

A standard XFull polymer module is still only around 4 oz. The geometry—not major mass—is doing most of the ergonomic work.

Current SIG XCarry modules exist in Small, Medium and Large grip circumferences and commonly weigh in the mid-3-ounce range.

Current factory XCarry modules can be configured to accept:

• 3.9-inch slide configurations.
• 4.7-inch configurations on listed modules.
• Optional internal grip weight.
• Factory X-Series magwell on compatible SKUs.

That makes XCarry especially useful when you want a full/carry-length magazine grip with multiple upper-length options.

Current XCompact modules are built around the shorter P320 package and commonly weigh around 3 oz.

SIG lists current XCompact modules for 3.6- and 3.9-inch slide configurations while warning that a full-size 4.7-inch upper can leave the guide-rod tunnel / recoil area exposed.

This is also where exact SKU verification matters: weight and magwell compatibility are not identical across every XCompact variation.

XFull modules are intended around full-length upper configurations and full/carry-length magazines.

SIG currently offers Small, Medium and Large XFull grip sizes, generally around 3.6–4 oz before optional weights or magwells.

Manual-safety XFull variants also exist, including current versions supporting 4.7-inch, 5-inch X5 and specific X-Comp slide configurations.

Many X-Series Carry and Full modules have an internal channel for SIG's removable grip weight.

SIG currently lists its factory P320 X-Series grip weight at about 1.6 oz.

That's a small but noticeable way to move the pistol's center of mass downward and rearward without moving all the way to a TXG or aluminum frame.

Adding mass below the slide increases total pistol mass and changes the relationship between the stationary frame and reciprocating upper assembly.

That can make the pistol feel steadier and reduce how violently the frame moves in the shooter's hand. It does not change the ammunition's actual momentum or eliminate the need for good grip technique.

TXG changes the P320 more dramatically than ordinary polymer modules.

SIG molds tungsten into the polymer itself, describing the goal as combining substantial frame weight with the flex characteristics of polymer.

Current examples include:

• TXG XCarry: roughly 12.1–12.3 oz.
• Laser-engraved TXG Full: about 13.1 oz.
• TXG Full module spec: around 14.1 oz before comparing complete accessory configuration.
• Complete TXG setups with internal weight and magwell can approach roughly 16.6 oz.

Going from a roughly 4-ounce XFull polymer grip to a 13–16-ounce TXG configuration adds close to three-quarters of a pound to the lower half of the pistol. That is a real mechanical change to balance, movement and carry weight.

• Competition.
• Range-focused pistols.
• Full-size setups where controllability matters more than carry weight.
• Builds using magwells and heavier optics.
• Users who specifically like a heavy frame beneath the reciprocating slide.

If you're trying to build the lightest concealed-carry P320 possible, TXG is solving the opposite problem.

AXG stands for Alloy X Grip.

Instead of molded polymer, the AXG module uses an aluminum chassis with separate grip panels and backstrap.

SIG's complete AXG Carry module weighs around 8.3 oz with G10 panels and backstrap, while the bare aluminum shell is listed around 6.4 oz.

That's roughly double the weight of a conventional X-Series polymer grip without reaching TXG competition-frame mass.

SIG's AXG is built around replaceable side panels and a removable backstrap.

That opens another layer of tuning:

• G10 panel texture.
• Wood panels.
• Different backstrap feel.
• Color / aesthetic changes without replacing the chassis.

SIG's current standard AXG Carry listings are designed around non-manual-safety FCUs and explicitly warn that those modules will not work with a manual-safety FCU. Don't assume metal AXG automatically means M17/M18 manual-safety compatible.

SIG's current X-Series and TXG product pages repeatedly warn that first-generation magazines using the older “SIG SAUER” marked baseplates may not clear the newer X grip geometry.

Newer magazines use revised basepads with the circular SIG mark and square locking tab.

This is a basepad-generation issue—not a reason to declare the entire older magazine body useless.

XFull, XCarry and TXG modules may accept SIG's removable magwell depending on the exact SKU.

But the magwell occupies physical space around the bottom of the magazine.

SIG's TXG/X5 guidance specifically notes that with the factory magwell installed, some factory flush baseplates no longer clear correctly and newer 21-round / competition-style basepads may be required.

Grip module + magwell + magazine basepad must be treated as one fitment system.

SIG offers dedicated manual-safety versions of Standard, X-Series and TXG modules.

A manual-safety FCU needs clearance in the grip module for the external safety levers.

Do not assume a non-safety grip can accept the safety-equipped FCU merely because the FCU otherwise drops into the chassis.

The P320 aftermarket doesn't merely copy SIG's factory shapes.

Manufacturers change:

• Grip angle.
• Trigger reach.
• Circumference.
• Undercut depth.
• Beavertail shape.
• Texture coverage.
• Dust-cover length.
• Material.
• Integrated gas pedals / thumb ledges.
• Magwell geometry.
• Weight-system compatibility.

Wilson Combat takes the lightweight-polymer approach but changes the ergonomics substantially.

Its current Compact module weighs around 3.2 oz and adds:

• Higher 1911-style beavertail.
• Modified backstrap.
• Higher trigger-guard undercut.
• More aggressive front / back / side texture.
• Internal slots for optional rod-style tungsten weights.

That's a good example of improving grip shape without automatically turning a carry pistol into a heavy competition pistol.

Wilson offers tungsten rods specifically for its WCP320 grip modules.

This gives the shooter another middle-ground option between ultralight polymer and a full TXG / metal-frame conversion.

Not every aftermarket grip needs a completely different chassis.

Grayguns currently starts with factory SIG X-Series modules and modifies the grip texture through laser sculpting / checkering.

Grayguns says its treatment increases textured coverage and depth while preserving smoother areas where the gun contacts clothing.

That's useful when the OEM geometry works but the shooter wants more traction rather than a completely different grip angle.

Icarus takes a more aggressive approach with machined 7075-aluminum P320 modules.

Current examples include:

• ACE XCompact: roughly 6.4 oz.
• ACE XCarry: roughly 8.9 oz.
• ACE XFull: roughly 9 oz.

These designs also change undercuts, beavertails, texture, thumb/index surfaces and frame rigidity.

Again: accepting the same general FCU family does not mean you're buying the same shooting experience.

Icarus' current XCarry / XFull modules, for example, note that adding the SIG X-Series magwell can require longer/new-style 21-round magazine basepads where 17-round magazines otherwise work without the magwell. Always read the aftermarket module's magazine and magwell notes—not just the FCU compatibility line.

P320 holsters typically index heavily around the trigger guard, slide and sometimes weapon light.

Aftermarket modules may change:

• Trigger-guard geometry.
• Dust-cover width.
• Accessory-rail dimensions.
• Gas pedals / thumb rests.
• Overall grip profile.

Wilson advertises broad holster compatibility for its WCP320. More aggressively reshaped aluminum modules deserve exact holster verification.

Competition and hard range use can benefit from extremely aggressive texture because the gun needs to stay planted with sweaty hands.

Concealed carry adds another variable: the same texture now rubs against shirts, skin and cover garments.

Grayguns deliberately leaves selected areas smoother for that reason, while increasing textured coverage where the hand actually needs traction.

Texture should match the pistol's job, not just look aggressive in photographs.

What we're actually trying to improve:

• Trigger reach.
• Ability to reach magazine release.
• Support-hand contact area.
• High grip beneath the beavertail.
• Control without shifting the firing hand.
• Repeatable presentation.
• Comfort appropriate to the pistol's use.

1. Identify FCU caliber family.
2. Identify manual-safety / non-safety configuration.
3. Check magazine-disconnect compatibility if applicable.
4. Choose Compact / Carry / Full around grip length and magazine requirement.
5. Verify dust-cover length against the upper.
6. Choose Small / Medium / Large circumference where offered.
7. Choose polymer / weighted polymer / TXG / aluminum intentionally.
8. Check magazine generation and basepad fit.
9. If adding a magwell, verify the exact basepads.
10. If adding grip weights, verify the exact module supports them.
11. Verify weapon-light / accessory rail and holster fit after changing frame geometry.
12. Then judge the actual ergonomics in your hand—not the internet's favorite grip.

The grip module is one of the P320's biggest advantages because you can change the entire shooter interface without changing the serialized FCU.

For carry, we care about fit, concealment and usable texture. For competition, we are absolutely willing to add frame mass, magwells and more aggressive grip surfaces when they make the gun faster and easier to control.

Stock isn't sacred. The upgrade just needs to make the pistol better at the job it's being built to do.

Standard polymer keeps the pistol light.

X-Series changes the ergonomics while staying light.

TXG adds serious lower-frame mass.

AXG and aftermarket aluminum modules add rigidity, weight and an entirely different feel.

Choose the module around the hand, the magazine, the upper and the job—not the name molded into the side.

• SIG SAUER — Standard P320 Compact Grip Module
  Standard polymer construction, Compact sizing and current module weight.
• SIG SAUER — Standard P320 Full Grip Module
  Full-size standard polymer module, grip sizing and factory specifications.
• SIG SAUER — P320 XFull Grip Module
  X-Series polymer construction, weight compatibility, magwell compatibility and magazine-basepad requirements.
• SIG SAUER — P320 XCarry Grip Module
  Carry X size, 3.9/4.7 upper compatibility, grip weight and magwell support.
• SIG SAUER — P320 XCompact Grip Module
  XCompact slide compatibility, dust-cover limitation, module weight and magazine-generation warning.
• SIG SAUER — P320 TXG Full Grip Module
  Tungsten-infused polymer, heavy-frame construction, magwell/weight configuration and magazine-basepad restrictions.
• SIG SAUER — P320 TXG XCarry Grip Module
  Current Carry-length TXG mass, 3.9/4.7 slide compatibility and magwell / grip-weight support.
• SIG SAUER — P320 AXG Carry Grip Module
  Aluminum chassis, G10 grip panels, backstrap, weight and non-manual-safety compatibility.
• Wilson Combat — WCP320 Compact Grip Module
  Lightweight aftermarket polymer, altered backstrap / undercut / beavertail geometry, texture and tungsten-weight support.
• Grayguns — P320 Laser-Sculpted Grip Modules
  Modified OEM X-Series modules, enhanced texturing, manual-safety options and magazine/basepad compatibility.
• Icarus Precision — ACE 320 XCarry
  7075-aluminum construction, module mass, X-Series magwell compatibility, magazine requirements and altered ergonomic geometry.
• Icarus Precision — ACE 320 XCompact
  Compact aluminum construction, 15-round magazine fit, 3.6/3.9 slide support, manual-safety versions and no-magwell configuration.

Research reviewed October 2, 2026. P320 grip-module compatibility changes by FCU caliber family, manual-safety configuration, magazine disconnect, grip length, dust-cover length, magazine generation and individual module SKU. Verify the exact manufacturer's current specifications before assuming interchangeability.

IRONKELLS ARMORY | SIG SAUER FORGE FILES

Same FCU. Build the Grip Around the Job.

Fit the hand. Match the magazine. Clear the slide. Add weight only when the weight actually helps.