Glock Optic Height Sights: What Height You Need for Each Red Dot

If you're adding a red dot optic like a Trijicon RMR, Holosun, Leupold DPP, or Vortex Defender to your Glock, you need backup iron sights that actually work with your setup. But not all optics use the same sight height — and getting it wrong can mean blocked views or an unusable sight picture.

This guide helps you choose the right optic-height iron sights for your Glock MOS or direct-milled slide, so your suppressor-height sights actually co-witness and don’t get in the way.

🔧 Why Optic Height Sights Matter for Glock Pistols

When you mount a red dot like the Holosun 507C or Trijicon RMR, your factory sights usually sit too low to be useful. That’s where optic-height sights (often called “suppressor-height”) come in — they rise just enough to co-witness through the window of your optic.

But there's no universal standard. Different optics sit at different heights above the slide, which means your front and rear sight heights need to match the optic’s profile.

---

📊 Glock Optic Sight Height Chart (By Optic Type)

The following optic height categories (1L through 9XL) come directly from AmeriGlo’s official 2025 guide and apply to most Glock Gen 4/5 MOS models and direct-milled slides.

🔎 Note: Heights may vary depending on whether your slide is factory-cut or aftermarket-milled. Always confirm before purchasing.

---

🛠️ What Sights to Buy Based on Your Red Dot

Here’s a quick breakdown of what AmeriGlo sight sets to look for based on your optic:

✅ Trijicon RMR / Holosun 507C / 508T

• Recommended: 3XL Height
• Examples: GL-506, GL-491, GL-193, GL-815

✅ Holosun EPS Carry / 507K / 407K

• Recommended: 1L Height
• Examples: GL-453, GL-480, GFT-140

✅ Trijicon RMRcc

• Recommended: 7XL Height
• Example: GL-527

✅ Leupold DPP

• Recommended: 9XL Height
• Example: GL-808

✅ Aimpoint ACRO / Holosun 509T

• Recommended: XL Height
• Examples: GL-429, GL-411, GL-191

---

✅ Frequently Asked Questions (FAQ)

Q: Can I use factory Glock sights with a red dot?
A: No — most factory sights are too low to co-witness with optics. You’ll need optic-height sights like those listed above.

---

Q: What is the difference between 3XL and 7XL AmeriGlo sights?
A: The difference is height. 3XL sights work with mid-height optics like RMR and Holosun 507C. 7XL is taller and made for low-mounted optics like RMRcc.

---

Q: Do I need suppressor-height sights to co-witness?
A: Yes. These are often called “suppressor-height,” but they’re really just tall enough to align with the red dot window.

---

Q: What if my red dot fails — can I still aim?
A: Absolutely. That’s the whole point of backup iron sights. Optic-height sights allow you to keep shooting even if your dot dies.

---

Q: Will these sights fit all Glocks?
A: The AmeriGlo part numbers listed are designed for Glock Gen 4/5 MOS and other slides cut to the RMR footprint. Always verify fit before ordering.

---