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X-Macro-specific aftermarket: full-size grip modules from Tyrant CNC and Wilson Combat, Shield RMSc optics on the factory cut (ROMEO-X, EPS Carry, 507K, Osight SE), True Precision threaded barrels for the 3.7-comp slide, TLR-7 Sub lights with 1913 keys, and holsters from Tier 1, Tenicor, PHLster, and Tulster.
The P365 X-Macro carries 17+1 in a frame that disappears under a cover garment, and the longer 3.7-inch slide and full-length grip tame muzzle rise better than the snubbier P365 and P365X. The upgrade path is narrower than it looks: most P365 parts fit, but a handful of categories (grip modules, threaded barrels, light keys, holsters) have X-Macro-specific picks that don't cross over from the standard P365 or P365 XL. This guide covers what actually fits the 3.7-inch slide and the 17-round grip, what to skip, and what to buy first. For broader family context across the P365, P365 XL, and X-Macro, see our full P365 upgrades guide. If you're cross-shopping the X-Macro Comp as an alternative configuration, our best compensated carry pistols guide ranks it against nine other factory-comped CCW pistols.
The X-Macro's factory build already includes the upgrades that bottleneck a standard P365: Shield RMSc optic cut, X-Series flat trigger (on the Comp variant), and an integrated comp slide. Spending order changes accordingly. Buy magazines first, then add a grip module if you want to push texture beyond factory, then optic, then light. Threaded barrels are a purpose-driven category, not a default upgrade.
Sling, light, backup sights, and QD mounts, the upgrades most builders add first.
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Base Platform
SIG Sauer / $780.00 base
Full-capacity P365 variant with 17+1 rounds in compact size
Upgrade Builder
Open any slot to add an upgrade; the total updates in place and every part keeps its tracked retailer link.
Micro red dots and reflex sights for faster target acquisition.
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Aftermarket grip modules and metal frames for improved ergonomics.
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Upgraded triggers with improved pull weight and reset.
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Compact and full-size weapon lights for target identification.
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Match-grade and threaded barrels for improved accuracy.
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The X-Macro factory frame already runs the longest P365 grip with the deepest undercut SIG ships. Aftermarket modules win on texture depth, beavertail size, and material, not on length. If you carry the X-Macro for deep concealment, the polymer picks (Wilson, Tyrant) are the practical answer; the aluminum Icarus pays for itself on the range and at competition, not inside the waistband.
Best Value Grip Upgrade
Best Aftermarket Polymer
Best Premium Aluminum
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The P365 X-Macro and X-Macro Comp slides ship with a factory Shield RMSc cut. Any RMSc-footprint optic drops in without a plate or modification. Question to answer first: open emitter or enclosed. Enclosed sealed-housing optics (ROMEO-X, EPS Carry, Osight SE) survive lint, sweat, and slide blowback that block the dot on open-emitter sights in IWB carry. The 507K X2 stays in the ranking because the K footprint and multi-reticle option remain the value play, but verify your slide cut accepts K-footprint optics before ordering.
Best Factory SIG Match
Best Overall Enclosed
Best Multi-Reticle Value
Best Budget Enclosed
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The X-Macro Comp already ships with the SIG X-Series flat trigger from the factory. The standard X-Macro ships with the curved trigger; both upgrade paths below are drop-in shoe swaps that change finger geometry but not pull weight. Neither is a performance unlock the way an aftermarket trigger is on a P320 or Glock.
Best Factory Match
Best Aftermarket Flat Face
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A threaded X-Macro barrel is the gate to suppressed carry and aftermarket comps. The standard X-Macro accepts the XL-pattern True Precision or SIG factory threaded barrel; the X-Macro Comp slide cannot be threaded because the integrated comp blocks access. If you own the Comp and want a can, you need True Precision's slide conversion kit, not a barrel swap.
Best Match-Grade Threaded
Best Factory Threaded
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The X-Macro accessory rail accepts both SIG-key and 1913-key TLR-7 Sub variants, but the holster ecosystem is built around the 1913 version. Tier 1 Concealed, Tenicor Velo Lux, PHLster Enigma, and Henry Holsters all design around the 1913-keyed light. The SIG-key variant fits the gun but cuts your holster pool roughly in half. For the full pistol light comparison across platforms, see our best pistol lights guide.
Best Slim Light for X-Macro
Best High-Output X-Macro Light
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The X-Macro's longer grip and 17-round magazine weight reward sidecar designs that distribute reload weight forward of the waistband, and body-contoured shells that rotate the grip into the body. Light-bearing carry assumes a 1913-key TLR-7 Sub; if you run unlit, the Tier 1 and Tulster picks below handle the bare gun. The wider concealed-carry holster matrix lives in our concealed carry holster guide.
Best AIWB Sidecar
Best Light-Bearing Standalone AIWB
Best Beltless Carry System
Best Minimalist IWB
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The standard X-Macro (3.7-inch slide and 3.7-inch barrel, no compensator) and the X-Macro Comp (3.7-inch slide over a 3.1-inch barrel with an integrated compensator) share most parts but split on a few. Knowing which upgrades cross saves a return shipment.
| Upgrade | Standard X-Macro | X-Macro Comp |
|---|---|---|
| Grip Modules | Wilson, Tyrant, Icarus, factory | Same; 17-rd mags required |
| Triggers | X-Series Flat (drop-in) | Ships with X-Series Flat from factory |
| Optics | Shield RMSc native | Shield RMSc native |
| Threaded Barrels | True Precision XL barrel ($170) | Requires TP slide conversion kit ($574) |
| Lights | TLR-7 Sub 1913 fits rail | Same 1913 rail; verify holster clears the ported slide |
| Holsters | Tier 1, Tenicor, PHLster, Tulster | Comp-specific cuts; check holster description |
| Suppressor | Yes with threaded barrel | No (integrated comp; 3.1-inch barrel not threadable) |
Key takeaway: Grip modules, triggers, and optics cross fully. Threaded barrels and suppressor compatibility split: the standard X-Macro takes a barrel swap, the X-Macro Comp needs a slide conversion. Holster cuts for the Comp need to be Comp-specific because the ported comp slide changes the muzzle profile.
| Category | Top Pick | Price | Why |
|---|---|---|---|
| Magazine | SIG P365 X-Macro 17rd (OEM) | $55 | Highest ROI; buy 3-5 before any other upgrade |
| Optic | Holosun EPS Carry | $389 | Enclosed RMSc, solar failsafe, side-load battery |
| Grip Module | Wilson Combat WCP365 | $65 | Best value, aggressive texturing, drop-in |
| Light | Streamlight TLR-7 Sub (1913) | $149 | Widest light-bearing holster ecosystem |
| Trigger | SIG X-Series Flat | $79 | Factory-grade flat shoe, drop-in, warranty intact |
| Threaded Barrel | True Precision Match P365XL | $170 | Match-grade, fits standard X-Macro (NOT Comp) |
| Holster | Tier 1 Axis Elite | $145 | AIWB sidecar, X-Macro grip + 17rd mag flex |
All seven top picks total $952. The first three (mags + optic + grip at $509) cover 80% of the practical capability gain.
Why magazines come first: The X-Macro's 17+1 capacity is the platform's headline feature, but it only matters if you actually have the mags to feed it. A single carry mag plus the one in the gun gives you 35 rounds before a reload pause; three carry mags plus training mags puts you at full duty load-out for under $300. Magazines wear with use, not age, so rotating a stack of five lets each one cool down between range sessions and extends total service life.
How many to buy: Plan for at least five. One in the gun, two on the body for carry rotation, two for training and class days. For home defense staging, add a sixth mag pre-loaded at the bedside or in a quick-access safe; the X-Macro's 17+1 capacity is most of the case for the platform over a standard P365, and you should lean into it.
Variant compatibility: The X-Macro 17-round magazine is a different SKU from the standard P365 and P365 XL mags. It will not seat flush in a 3.1-inch standard P365 or a 3.7-inch P365 XL with stock grip; use the X-Macro grip module to feed 17-round mags from those hosts. Aftermarket P365 magazines are thin compared to Glock or P320; stick to OEM SIG factory mags for the carry gun.
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The X-Macro is the deepest aftermarket in the integrally-compensated compact 9mm class, but it competes against the P365 XL Comp and the subcompact field below it. For the broader subcompact picture, see our best subcompact 9mm pistols guide. For the head-to-head against the Hellcat and Glock 43X, our best CCW pistol guide covers the matrix. The SIG Fuse Comp, the X-Macro's slide-integrated-compensator sibling reviewed in our P365-FUSE COMP article, is the closest factory alternative if you want the comp without the X-Macro grip length. Use the rifle and pistol builder to spec an X-Macro configuration with the picks above already compatibility-checked against the host.

Avid shooter with 9+ years of experience including competition shooting. Built 10+ AR-pattern rifles and several handgun platforms for home defense, competition, and suppressed night shooting.
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