Accessory

GLOCK 43X MOS + Holosun EPS Carry (2 MOA) — Accessory Compatibility & Recommendation Guide

Product Compatibility Overview

The GLOCK 43X MOS is a Slimline 9x19mm, subcompact pistol built around concealability while still offering optic capability and a factory accessory rail. From GLOCK, key MOS-specific features include a micro-optic-ready slide cut and the GLOCK Slim Mounting Rail for subcompact lights. (us.glock.com)

Mounting systems & standards (what fits and why it matters):

  • Optics cut: GLOCK’s Slimline MOS cut is designed around the Shield RMSc footprint and uses M4 screws. Some Slimline pistols instead use a MOS-K cut (accepting Holosun K or RMSc footprints without plates). Verifying which cut you have avoids wrong-plate/wrong-screw problems and potential optic damage. (us.glock.com)
  • Your included optic: The Holosun EPS-CARRY-RD-2 is an enclosed-emitter optic with K-footprint compatibility and includes an RMSc-to-K adapter plate, plus multiple screw sets. This matters because on an RMSc cut you may be mounting via the included adapter plate depending on your slide cut / fitment. (holosun.com)
  • Weapon light rail: The 43X MOS uses the Slim Mounting Rail, which is not the same as a full-size 1913/Pic rail; compatibility is highly model-specific (choose a “43X MOS/48 MOS” keyed light). (us.glock.com)

Essential Accessories

1) Extra magazines (reliability + training volume):

  • If your pistol ships with higher-capacity magazines (your context indicates 15+1), buy at least 2–4 additional OEM-quality mags so you can rotate carry mags and dedicate mags to training.
  • Practical why: magazines are the #1 wear/consumable item for semi-auto pistols; more mags means better training efficiency and less downtime.

2) Quality belt + magazine carrier (carry stability):

  • A purpose-built gun belt dramatically improves concealment and comfort with the slim 43X footprint—especially with an optic.
  • Add a single spare-mag carrier to balance weight and improve reload consistency.

3) Safe storage / quick access (security):

  • A quick-access handgun safe (mechanical or electronic) is the best “accessory” for preventing unauthorized handling while still supporting realistic home-defense access.

Optics and Sighting Systems

You already have an excellent carry optic: the Holosun EPS-CARRY-RD-2.

Why the EPS Carry is a strong EDC choice:

  • Enclosed emitter helps resist lint, sweat, and debris (a real-world concealed-carry issue).
  • Side-loading CR1620 battery allows battery changes without removing the optic (less chance of losing zero).
  • Holosun lists ultra-low deck height and co-witness friendliness with many factory-height irons (often still worth validating with your sight picture). (holosun.com)

Recommended sighting setups (choose one):

  • Keep factory-height sights if you get a clean window view and can index reliably.
    • Best for: maximum concealment, minimal snag risk.
  • Add “optic-height” backup irons if you want a more redundant system (recommended for defensive carry).
    • Best for: confidence if the dot is occluded, dead battery, or during unconventional shooting positions.

Optic mounting best-practices (critical on Slimline MOS):

  • Confirm whether your slide is Slimline MOS vs MOS-K before selecting plates/screws.
  • Use the correct screw type/length for the footprint; GLOCK notes the Slimline MOS cut uses M4 screws, and Holosun provides multiple screw sets in the box for different mounts. Mixing screws can bottom out or strip threads. (us.glock.com)

Tactical Enhancements

Weapon light (most impactful defensive upgrade):

  • Best overall (EDC + capability): Streamlight TLR-7 X sub (GLOCK 43X MOS/48 MOS)
    • Why it’s valuable: strong output in a compact package, and the “X sub” supports a rechargeable battery option while staying purpose-fit for the Slimline rail.
    • Streamlight specifically lists versions that fit GLOCK 43X MOS/48 MOS (don’t buy a generic “subcompact” version without the correct keying). (streamlight.com)

Lasers (situational):

  • I generally treat pistol lasers as optional for most users; they can help in specific low-light or compromised positions, but they add complexity and bulk. Prioritize a light and solid dot competency first.

Ergonomics (comfort + consistency):

  • Grip texture aid (tape/grip panels): Helps maintain control with sweaty hands without permanently modifying the frame.
  • Extended controls: Use caution—extended slide stops/mag releases can increase printing or induce inadvertent activation on slim carry guns.

Performance Upgrades

Reliability-first rule for carry pistols: change as little as necessary.

High-value upgrades (if you can verify reliability with your ammo):

  • Trigger shoe/connector changes: Can improve feel, but may affect reliability and legal defensibility in some jurisdictions. If you do it, keep it conservative and test thoroughly.
  • Recoil spring assemblies: Typically unnecessary unless solving a specific problem.

Professional installation recommendations:

  • If you’re not experienced with Glock sight installs and threadlocking optics screws, have a competent armorer install:
    • backup irons
    • optic (verify screws/plate/torque)
    • weapon light fit check

Holsters and Carry Gear

Because you have an optic (and likely a weapon light if you add one), holster selection must be specific.

Holster compatibility checklist (what must match):

  • Model: Glock 43X MOS
  • Optic cut: must clear Holosun EPS-CARRY-RD-2
  • Light bearing: if you add the Streamlight TLR-7 X sub (GLOCK), the holster must be molded for that exact light model/version.

Carry styles that work well for the 43X MOS:

  • IWB/AIWB Kydex: best mix of concealment and consistent draw.
  • OWB (range/training): easier reps; keep it tight to the body if used for concealment.

Maintenance and Storage Accessories

Cleaning (keep it simple and consistent):

  • Quality CLP or dedicated solvent + lubricant, nylon brush, patches, and a 9mm bore brush.
  • Microfiber cloth + lens-safe cleaner for the EPS Carry window.

Optic maintenance (EDC reality):

  • Enclosed optics reduce debris issues, but the exterior window still needs periodic cleaning.
  • Replace batteries on a schedule (e.g., every 6–12 months) even if “still working,” because carry guns are about certainty.

Storage:

  • Quick-access safe for home.
  • A small lockable case for travel to/from training (comply with your state’s transport rules).

Budget Considerations and Value Analysis

(Since your provided price/MSRP is 0, I’m not inferring total system cost. Below are practical “tiers” to help you allocate funds.)

Priority list (best return on money/time):

  1. Holster that fits optic (and light, if used)
  2. Weapon light (if home-defense/low-light is a concern)
  3. Extra magazines
  4. Spare battery + lens care
  5. Optic-height irons (if you want redundant aiming)
  6. Optional: grip texture, minor ergonomic tweaks
  7. Last: trigger/performance modifications

Budget-minded approach:

  • Keep the pistol mechanically stock.
  • Spend on: holster + belt + training ammo + a reliable light.

Mid-tier value approach:

  • Add: optic-height irons + more magazines.

Higher-end approach:

  • Add: dedicated training holster setup, upgraded sights, and professional installation/inspection.

Installation and Compatibility Guide

Optic mounting (common issues & solutions):

  • Issue: wrong cut assumption (MOS vs MOS-K).
    • Solution: verify the cut type using GLOCK’s guidance; the cut determines whether you need an adapter plate and which screws to use. (us.glock.com)
  • Issue: screws bottoming out / stripping.
    • Solution: use the correct screw set and verify engagement depth; Holosun provides multiple screw standards in-box for different mounts. (holosun.com)

Light fitment:

  • Choose the light model explicitly intended for GLOCK 43X MOS/48 MOS; Streamlight lists these variants and identifiers for the TLR-7 X sub line. (streamlight.com)

DIY vs professional:

  • DIY is reasonable for: grip tape, basic cleaning, battery swaps.
  • Strongly consider professional help for: sight pressing, optic screw/plate selection verification, and any trigger modifications.

Brand Recommendations and Reviews

Optics:

  • Holosun EPS-CARRY-RD-2 is already an excellent choice for a slim carry pistol due to its enclosed design and carry-oriented features. (holosun.com)

Lighting:

  • Streamlight’s subcompact-focused models are a practical balance of size, durability, and output—just ensure you buy the correct GLOCK 43X MOS/48 MOS fit variant. (streamlight.com)

Core advice on “reviews”:

  • For a carry gun, prioritize repeatable function: once you choose a reputable optic/light, your biggest performance gains come from holster quality and training time.

Legal and Safety Considerations

  • Always verify your state/local regulations on concealed carry, weapon-mounted lights/lasers (rarely restricted, but training and use-of-force policies matter), and magazine capacity.
  • Safe handling during installation: GLOCK emphasizes ensuring the pistol is unloaded (mag removed, chamber empty) before installing/removing optic cover plates/plates/optics. (us.glock.com)
  • After any change (optic, sights, trigger, mags): function test and confirm zero with your chosen defensive ammunition.

Sources

GLOCK, Inc. "G43X MOS." GLOCK (US). n.d. https://us.glock.com/en/products/commercial-firearms/pistols/g43x-mos

GLOCK, Inc. "GLOCK OPTIC READY SYSTEM (Optic Mounting)." GLOCK (US). n.d. https://us.glock.com/en/about/technology/optic-mounting

GLOCK, Inc. "GLOCK Introduces Optic Ready Slimline Models (G43X and G48)." GLOCK (US). August 24, 2020. https://us.glock.com/en/press-release/news-page/glock-introduces-optic-ready-slimline-models-g43x-and-g48

Holosun. "EPS-CARRY-RD-2 Enclosed 2 MOA Red Dot." Holosun. n.d. https://www.holosun.com/products/eps-carry-rd-2

Holosun. "2026 Catalog." Holosun (PDF). 2026. https://www.holosun.com/uploads/20260122/6186dd54c6fd678d8fb9be32e4ecf007.pdf

Streamlight. "Streamlight Launches TLR-7 Sub Weapon Light." Streamlight. n.d. https://www.streamlight.com/community/blog/streamlight-launches-tlr-7-sub-weapon-light

Streamlight. "TLR-7 X sub | Rechargeable Rail-Mounted Light." Streamlight. n.d. https://www.streamlight.com/products/detail/tlr-7-sub

Streamlight. "TLR-7 X sub Data Sheet." Streamlight (PDF). n.d. https://www.streamlight.com/docs/default-source/data-sheet/tlr-7-x-sub_datasheet.pdf