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Home / Pistols / GLOCK 43X MOS

What red dots fit the GLOCK 43X MOS?

22 of the 75 optics tracked here mount to this slide, and 21 of those need no adapter plate. This slide uses GLOCK Slimline MOS (43X / 48).

Mount systemGLOCK Slimline MOS (43X / 48)
Optics that fit22 of 75
No plate needed21
No plate to buy22
Plate to slideper optic manual
Slide tappedM4 × 0.7
How this slide mounts an opticMilled for the RMSc pattern with M4 screws — no plate, and no plate is available. Holosun K optics bolt on and simply leave the rear posts unused.
Screw thread trapGLOCK taps the Slimline MOS slide M4 × 0.7. A Holosun K optic will bolt on, but the #6-32 screws in the Holosun box will not thread into it — you need M4.

Cheapest ways to mount it

Cheapest overall$60–150SIG Sauer ROMEOZerodirect — no adapterBuild sheet →
Cheapest with no plate$60–150SIG Sauer ROMEOZerodirect — no adapterBuild sheet →
Cheapest enclosed emitter$300–450Holosun EPS-COREdirect — no adapterBuild sheet →

Every optic, and how it mounts

ItemFootprintHow it mountsCost to mount
Direct — 14
Crimson Trace CTS-1550Shield RMScdirect — no adapter$150–300
Holosun EPS-CORE EnclosedShield RMScdirect — no adapter$300–450
JP Enterprises JPointShield RMScdirect — no adapter$150–300
Olight Osight SShield RMScdirect — no adapter$60–150
Primary Arms Classic 21 mm MicroShield RMScdirect — no adapter$60–150
Riton 3 TACTIX MPRD 2Shield RMScdirect — no adapter$150–300
Shield Sights RMS2Shield RMScdirect — no adapter$150–300
Shield Sights RMScShield RMScdirect — no adapter$150–300
SIG Sauer ROMEO-X CompactShield RMScdirect — no adapter$150–300
SIG Sauer ROMEOZeroShield RMScdirect — no adapter$60–150
SIG Sauer ROMEOZero EliteShield RMScdirect — no adapter$150–300
Swampfox Sentinel IIShield RMScdirect — no adapter$60–150
Viridian RFX35Shield RMScdirect — no adapter$60–150
Vortex Defender-CCWShield RMScdirect — no adapter$150–300
Direct · alt — 7
Holosun 407K X2Holosun Kdirect — no adapter$150–300
Holosun 507K X2Holosun Kdirect — no adapter$300–450
Holosun 507K X3 / 407K X3Holosun Kdirect — no adapter$300–450
Holosun EPS EnclosedHolosun Kdirect — no adapter$300–450
Holosun EPS Carry EnclosedHolosun Kdirect — no adapter$300–450
Holosun SCS Carry EnclosedHolosun Kdirect — no adapter$300–450
Olight Osight KHolosun Kdirect — no adapter$60–150
Plate — 1
SIG Sauer ROMEO2 EnclosedSIG Romeo2plates included with the optic$450–650
No fit — 53
ADE Delta ProTrijicon RMRno known route$60–150
ADE NUWAcc ProTrijicon RMRccno known route$60–150
Aimpoint ACRO C-2 EnclosedAimpoint ACROno known route$450–650
Aimpoint ACRO P-1 EnclosedAimpoint ACROno known route$450–650
Aimpoint ACRO P-2 EnclosedAimpoint ACROno known route$650–900
Aimpoint COA EnclosedAimpoint COA / A-Cutno known route$650–900
Aimpoint Micro T-2 EnclosedAimpoint Microno known route$650–900
Ameriglo HavenTrijicon RMRno known route$150–300
Burris FastFire 3Docter / Noblexno known route$150–300
Burris FastFire 4Docter / Noblexno known route$150–300
Bushnell RXS-100Leupold DeltaPoint Prono known route$150–300
C-More RTS2C-More RTS2 / STS2no known route$300–450
C-More STS2C-More RTS2 / STS2no known route$300–450
C&H Precision CompTrijicon RMRno known route$300–450
Cyelee Cat / WolfTrijicon RMRno known route$60–150
EOTECH EFLX MiniLeupold DeltaPoint Prono known route$300–450
Holosun 407C X2Trijicon RMRno known route$150–300
Holosun 407COMPTrijicon RMRno known route$300–450
Holosun 507-PromaxTrijicon RMRno known route$300–450
Holosun 507C X2Trijicon RMRno known route$300–450
Holosun 507C X3 / 407C X3Trijicon RMRno known route$300–450
Holosun 507COMPTrijicon RMRno known route$300–450
Holosun 508T X2Trijicon RMRno known route$300–450
Holosun 509T EnclosedHolosun 509Tno known route$450–650
Holosun SCS 320 EnclosedHolosun SCS (320)no known route$300–450
Holosun SCS MOS EnclosedHolosun SCS (MOS)no known route$300–450
Leapers UTG OP3 MicroDocter / Noblexno known route$60–150
Leupold DeltaPoint ProLeupold DeltaPoint Prono known route$300–450
Lucid Optics E7 EnclosedAimpoint ACROno known route$150–300
Meopta MeoSight IVDocter / Noblexno known route$150–300
Meprolight MPO-DFTrijicon RMRno known route$300–450
Noblex Sight III / Docter Sight CDocter / Noblexno known route$300–450
Riton 3 TACTIX PRDTrijicon RMRno known route$150–300
SIG Sauer ROMEO-X EnclosedSIG-LOCno known route$300–450
SIG Sauer ROMEO-X ProLeupold DeltaPoint Prono known route$300–450
SIG Sauer ROMEO-X SIG-LOC Compact EnclosedSIG-LOCno known route$450–650
SIG Sauer ROMEO-X SIG-LOC Pro EnclosedSIG-LOC PROno known route$450–650
SIG Sauer ROMEO1PROSIG Romeo1Prono known route$300–450
Sightmark Mini Shot A-SpecDocter / Noblexno known route$60–150
Steiner MPS EnclosedAimpoint ACROno known route$450–650
Swampfox Justice IITrijicon RMRno known route$150–300
Swampfox Liberty IITrijicon RMRno known route$150–300
Trijicon RCR EnclosedTrijicon RCRno known route$650–900
Trijicon RMR HDTrijicon RMRno known route$650–900
Trijicon RMR Type 2Trijicon RMRno known route$450–650
Trijicon RMRccTrijicon RMRccno known route$450–650
Trijicon SROTrijicon RMRno known route$450–650
Viridian RFX45 EnclosedAimpoint ACROno known route$150–300
Vortex Defender-SLLeupold DeltaPoint Prono known route$150–300
Vortex Defender-STLeupold DeltaPoint Prono known route$300–450
Vortex Defender-XLLeupold DeltaPoint Prono known route$300–450
Vortex VenomDocter / Noblexno known route$150–300
Vortex ViperDocter / Noblexno known route$150–300

Check a specific pairing

The interactive fit checker opens with this pistol already selected and gives you a single verdict for any optic, plus a build sheet with the plate SKU, screw threads, torque figures and install order. Every "how it mounts" cell above opens that pairing's verdict — the most asked-about ones on a page of their own, the rest in the fit checker — at an address you can send to someone.

Deciding between a few? Compare 3 of the most-asked-about optics on this slide side by side — window, weight, emitter, cost to mount and sight co-witness.

Something on this page wrong? Say what it should be. Corrections from someone who owns the pistol are why this is worth more than a spec sheet — and nothing here changes without a source, so bring one.