Swapping out an optic on a Glock 43X MOS is only as good as the adapter plate anchoring it. The right plate means zero wobble, a clean co-witness, and no lost screws under recoil.
This guide is for Glock 43X MOS and 48 MOS owners who want to mount Holosun 407K or 507K optics with the RMSc footprint. Every plate here solves the fitment gap but with different strengths in thickness, material, and installation ease.
Each pick is reviewed for real-world durability, mounting reliability, and how well it preserves your sight picture. You’ll see standout features and recurring complaints, so you can skip what doesn’t fit your priorities.
Scan the key takeaways, compare specs, and read the buying guide before picking. If co-witness or thin profile matters, pay close attention to the winner.
Our overall best pick: Optic Adapter Plate for Glock 43X 48 MOS →
| Product | Material | Plate Thickness | Mounting Hardware | Finish | |
|---|---|---|---|---|---|
| Optic Adapter Plate for Glock 43X 48 MOS | 7075-T6 Aluminum | Ultra-low (exact thickness not specified) | 4 M4 screws, T10 wrench included | Type III Hard Anodized | See on Amazon |
| Titanium Optic Adapter Plate for Glock 43X MOS and 48 MOS | Grade 5 Titanium | 0.058 inch | Multi-length screws included | MIL-SPEC Type III Hard Coat Anodized | See on Amazon |
| DPP Titanium Adapter Plate for Glock 43X/48 MOS Hellcat OSP | 6AL4V Titanium | 0.058 inch | Custom SCM435 screws included | Black PVD | See on Amazon |
| C+H Red Dot Mounting Plate for Glock 43X/48 MOS and Holosun | Aircraft-Grade Aluminum | Ultra-thin (exact thickness not specified) | Mounting screws included | MIL-SPEC Type III Hard Coat Anodized | See on Amazon |
| Optic Adapter Plate for Glock 43x/48 MOS and Holosun | Aircraft-Grade Aluminum | Ultra-thin (exact thickness not specified) | M4 x 10.5mm screws included | MIL-SPEC Type III Hard Coat Anodized | See on Amazon |
Optic Adapter Plate for Glock 43X 48 MOS
The pass-through design keeps mounting height minimal, helping preserve co-witness capability with factory iron sights. Installation is quick and straightforward, with the kit including four upgraded M4 screws and a T10 wrench.
The adapter snaps in with almost no wiggle room, providing a rock-solid fit that survives thousands of rounds and heavy recoil without shifting or loosening. Machined from 7075-T6 aircraft-grade aluminum and finished with Type III hard anodizing, the plate offers excellent durability, resisting both corrosion and impact.
The mounting hardware is strong, and pre-applied threadlocker simplifies installation. Owners report a clean, professional look after mounting, with no rough edges or obvious gaps, and the plate holds zero reliably over time.
A minor gap (a few thousandths) can occur if installation is rushed, but this does not affect function or stability. The brand is lesser-known, so long-term durability is still being proven, though reviews so far are positive.
This plate is best for shooters who want a low-profile, secure mount for Holosun optics and value a clean factory look.
Strengths
- Ultra-low profile preserves co-witness
- Tight, gap-free fit with no movement
- Strong M4 hardware with threadlocker
- High-strength 7075-T6 aluminum build
- Easy drop-in installation kit
Trade-offs
- Minor gap possible if not installed carefully
- Brand is less established, long-term durability still being proven
- Only fits Holosun K-series optics
Titanium Optic Adapter Plate for Glock 43X MOS and 48 MOS
Installation is straightforward thanks to the one-piece design and included screw kit, with several reviewers noting a perfect, glove-like fit on both Glock and Hellcat Pro slides. The titanium construction keeps weight down and adds noticeable rigidity, resisting flex even when stressed by heavy recoil or mounting pressure.
The plate’s 0.058-inch profile minimizes height over bore, helping maintain co-witness capability and improving follow-up shot speed compared to thicker plates. The reinforced impact posts and hard coat anodized finish stand out in real use, especially for shooters running higher round counts.
After 300 rounds, the plate holds zero and remains flush with the frame, showing no signs of loosening or movement even in demanding conditions. Quality control is consistent, with clean machining and no visible burs or rough edges.
The main trade-off comes with fitment precision; you must ensure the plate sits fully flush before tightening, or it may not seat properly. While the plate adapts smoothly to Holosun K-series sights, some owners needed to double-check screw lengths if moving between platforms.
This model is best for those who want premium materials and a low-profile mount for regular range use and carry.
Strengths
- Grade 5 titanium build resists flex and impact
- Ultra-thin 0.058-inch profile maintains co-witness
- Snug, movement-free fit on Glock 43X/48 MOS and Hellcat Pro
- Easy installation with included screw kit
- Consistent quality machining and finish
Trade-offs
- Requires careful flush seating before tightening
- Screw length may need adjustment between platforms
- Limited compatibility beyond Holosun K-series optics
DPP Titanium Adapter Plate for Glock 43X/48 MOS Hellcat OSP
This plate is precision CNC machined from 6AL4V titanium and finished with black PVD, giving it a premium look and feel without adding weight or bulk. The ultra-low 0.058-inch profile keeps the optic close to the slide, avoiding unnecessary height and supporting a clearer sight picture.
The included SCM435 alloy steel screws come in custom lengths, ensuring a secure mount and providing options for future optic swaps or platform changes. Owners highlight the plate’s easy installation and solid fit, with no burs or movement once tightened.
The adapter remains steady during regular use and shows no sign of loosening after hundreds of rounds. Customer service is responsive and fast, quickly resolving order issues and providing replacements for mistaken purchases.
The lifetime warranty adds peace of mind for long-term reliability. The main complaint is loss of iron sight co-witness after installation, a limitation of Springfield slides more than the plate itself.
Shipping was occasionally delayed, but product performance was not affected. This plate is best for daily carry or concealed carry shooters who want a clean, low-profile install for Holosun sights on slimline Glock models.
Strengths
- Ultra-thin 0.058-inch profile keeps optic low
- Titanium build resists wear and impact
- Custom-length screws for secure mounting
- Easy, quick installation with no burs
- Responsive customer service and lifetime warranty
Trade-offs
- Iron sight co-witness may be lost depending on slide
- Occasional shipping delays
- Not compatible with all optic brands
C+H Red Dot Mounting Plate for Glock 43X/48 MOS and Holosun
The standout feature is its patented ultra-thin aircraft-grade aluminum design, which keeps the optic as low as possible for fast target reacquisition. Reviewers consistently praise the flawless fit, noting that the Holosun 407K/507K sits securely with zero play or movement, even before screws are tightened.
Installation is simple, but requires attention to screw length, especially on the right side over the extractor, where a shorter screw is needed to avoid interfering with extraction. Build quality is top-tier, with precision machining and MIL-SPEC Type III hard coat anodizing that protects against corrosion and wear.
The plate remains steady after hundreds of rounds, never loosening or shifting, and complements the look of the slide. The included mounting screws and customer support are reliable, quickly resolving any issues with hardware.
The main drawbacks are price and hardware details: this plate costs more than most, and the kit does not always include the right-length screw for the extractor side, leaving some users to modify or source their own. This plate is best for shooters who demand a perfect fit and secure mounting for Holosun optics on their Glock 43X/48 MOS.
Strengths
- Ultra-thin profile keeps optic low
- Precision fit with zero movement
- Aircraft-grade aluminum with hard coat anodizing
- Easy installation and secure mounting
- Excellent customer service and support
Trade-offs
- Higher price than other plates
- Short extractor-side screw not always included
- Only fits Glock 43X/48 MOS and Holosun K-series optics
Optic Adapter Plate for Glock 43x/48 MOS and Holosun
Installation is hassle-free, with everything lining up precisely and no need for slide modifications or adjustments. The plate is crafted from aircraft-grade aluminum and finished with MIL-SPEC hard coat anodizing, offering durability and a premium feel.
The low-profile design keeps the optic close to the slide, helping shooters reacquire targets quickly between shots. Fitment is consistently tight, with no play or slop after mounting, and the adapter sits flush on both Glock 43X and 48 MOS slides.
The screws are included and seem to hold securely, ensuring the optic remains locked in place during regular use. The plate bridges the gap between the Shield RMSc footprint and Holosun’s screw pattern, solving a common compatibility headache for slimline Glock owners.
The plate is still new enough that long-term zero retention is being watched, but initial feedback is positive. Compatibility is limited strictly to Holosun 407K/507K optics and Glock 43X/48 MOS slides.
This is ideal for shooters who want a straightforward, well-machined solution without extra bulk.
Strengths
- Precision-machined for exact fit
- Low-profile design aids target reacquisition
- Durable aircraft-grade aluminum with hard coat anodizing
- Easy installation, no slide modifications needed
- Flush, movement-free mounting
Trade-offs
- Long-term zero retention still being proven
- Limited compatibility (only Holosun K-series, Glock 43X/48 MOS)
- Small number of reviews, less proven in high round counts
01Plate thickness
The thickness of the adapter plate determines whether you can co-witness iron sights. Plates over 0.058 inches often block the lower third, making rapid target acquisition harder for some shooters. Always check thickness specs before buying, and avoid plates advertised as ‘universal’ without clear measurements.
02Material quality
Titanium and 7075-T6 aluminum are the best choices, resisting deformation and corrosion under heavy use. Cheaper alloys or basic steel can flex or rust, leading to loose fits and sight drift. Inspect the product listing for material grade, ‘Grade 5 titanium’ or ‘7075-T6’ are reliable markers.
03Fit and footprint compatibility
The plate must match both Glock MOS and RMSc optic footprints precisely. Generic Glock MOS plates can leave gaps or misalign screws. Always confirm compatibility with your optic model and avoid plates that require extra shimming, which can introduce movement.
04Screw and lug design
Integrated recoil lugs and properly machined screw holes prevent optic shifting under recoil. Plates with sloppy tolerances or without lugs allow the sight to loosen or lose zero. Look for plates with ±0.001 inch precision and tight screw fit.
05Ease of installation
A well-designed plate installs cleanly without the need for extra tools, shims, or filing. Plates that require modification or don’t come with the right screws can frustrate, waste time, and compromise reliability. Check for clear instructions and included hardware before purchase.