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HANDGUNMid-Range

Glock

Glock 43X MOS

Optic-ready slimline Glock with rail and MOS slide

Key Highlights

  • MOS optic cut
  • Slim rail added
  • Complete carry package

Specifications

Price
$485
Weight
1 lb 2.5500000000000007 oz
Calibers
9mm
Rail Type
picatinny

Capability Profile

0-10 Scale Across 8 Axes

Compatibility Tags

family: handgunframe: glock-slimlineinterface: picatinny-pistol-slimoptic-mount: shieldmag-type: glock-slimline-43x48

Overview

The Glock 43X MOS adds the two features most requested on the original 43X: an optic-ready slide and an accessory rail. Standard Slimline MOS slides accept Shield RMSc footprint optics directly, while newer Slimline MOS-K slides accept Holosun K and RMSc footprints without adapter plates. That means popular micro dots like the Holosun 407K, 507K, EPS Carry, and SCS Carry may be direct-mount, plate-mounted, or direct after permanent RMSc recoil-lug modification depending on the exact slide cut. The integrated slim rail accepts compact lights like the Streamlight TLR-7 sub.

This transforms the 43X from a "just the gun" carry pistol into a fully-featured defensive package. With the factory 15-round Slimline magazine now standard, the 43X MOS pairs 15+1 capacity with optic capability and weapon light compatibility in a package that still conceals easily. This is the configuration many consider the ultimate concealed carry Glock.

The Slimline MOS system sits lower than full-size MOS plate systems, but buyers should verify whether their case label says MOS or MOSK before ordering screws, plates, or an optic. Filing or milling the RMSc recoil lugs can make Holosun K optics sit lower than a plate, but it is permanent gunsmith work. The front accessory rail is narrower than G17/G19 rails but accepts lights designed for slim pistols.

Key Features

  • Slimline MOS optic cut, Shield RMSc or MOS-K depending on SKU
  • Integrated slim accessory rail
  • 15+1 factory capacity (2026 Slimline mag)
  • Shield Arms S15 compatible
  • Lower optic mount than full-size MOS plate system
  • Full grip for improved control
  • Complete carry package ready
  • Factory warranty maintained

Pros

  • +Low Slimline MOS optic mount
  • +Integrated rail for lights
  • +Slim profile maintained
  • +15+1 factory capacity with the standard mag catch
  • +Lower optic position than full-size MOS
  • +Complete modern carry package

Cons

  • Standard Slimline MOS and MOS-K slides use different screw and footprint details
  • Rail is slim-pistol specific
  • Price premium over standard 43X
  • Shorter sight radius than larger Glocks

Detailed Specifications

caliber
9mm
Barrel Length
3.41 inches
Overall Length
6.50 inches
width
1.10 inches
weight
18.55 oz
capacity
15+1
trigger
Safe Action, ~5.5 lb pull
barrel
Glock Marksman Barrel, nDLC finish
sku
UX4350203FRMOS
msrp
$582

Compatible Components

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