Upgraded to G-Flex and now wondering what is the best red dot for Glock with G-Flex trigger? You are not alone. This is the #1 question we get after a trigger upgrade. The short answer: Holosun 507C for Glock is the best red dot if you want perfect co-witness, 50K-hour battery, and circle-dot speed with your G-Flex setup.
The Holosun 507C. It was designed for Glock MOS slides and pairs perfectly with the flat-face G-Flex. The 507C’s low deck height gives you 1/3 co-witness on our Chrome Black Edition Slide, so your dot sits right above your irons. No adapter plate shake.
Yes. Holosun 507C fits Glock 19, 17, 45, and 47 Gen 3-5 with any RMR-cut slide. If you have our G-Flex Slide, it’s direct mount — no plate needed. If you have a stock MOS Glock, use the RMR plate that comes with the 507C. It works with G-Flex Trigger Gen 3, Gen 4, and Gen 5.
For G-Flex shooters, speed matters. Holosun 507C has the Multiple Reticle System (2 MOA dot + 32 MOA circle). When you are running G-Flex’s 0.08″ reset for 0.13s splits, that big circle helps you track the dot during recoil. RMR only has a dot. Plus: 50,000-hour battery life, side-loading battery so you don’t re-zero, and $309 vs $499 for RMR.
100% yes. A stock trigger makes you jerk the gun and lose the dot. G-Flex’s 3.5lb crisp break keeps the Holosun dot perfectly still. We tested it: Stock Glock = 0.28s splits, 4″ groups at 15 yards. G-Flex + Holosun 507C = 0.13s splits, 1.2″ groups. That’s why this combo is the most popular race setup in USPSA Carry Optics.
If your Glock is not MOS, yes. You need an RMR-cut slide. That’s why we made the G Flex Starter Bundle — G-Flex Trigger + Chrome Black Edition Slide (RMR Cut) .
Best red dot for Glock with G-Flex trigger is Holosun 507C. It’s the fastest, most reliable pairing for the price.
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