Home / Guides / Red Dot on a Carry Gun: What It Means for Your Holster
Red dots on carry guns went from a novelty to the default in about four years. If you bought your pistol before that shift, your holster probably isn't cut for one — and buying an optic without checking that is how people end up buying a second holster.
An optic adds two things to the pistol's profile: height above the slide and width at the sides of the optic body. Neither is large, but a holster made before optics were standard has no room for either.
Specifically:
A holster pinching an optic isn't just uncomfortable. It causes three real problems:
Continuous pressure on the optic as the gun sits in the holster can loosen the mounting screws over time. A red dot that was zeroed in January can be off in March. You will not notice until you shoot — which is the worst time to find out.
If the optic contacts the holster, the pistol may not go all the way down. That means inconsistent retention, inconsistent draw, and a pistol that isn't where you expect it to be.
Repeated pressure at a single point on a polymer or thin aluminum optic body is a failure waiting to happen. This is more common with cheaper optics than with duty-grade ones, but it happens.
A correctly cut holster is relieved both vertically and laterally around where the optic sits. The optic should never touch the holster body in normal carry — there should be visible clearance.
On a well-made holster you can usually see the relief molded into the shell, visible as a raised section or a cutout above the standard slide channel.
One thing people don't anticipate: an optic raises the pistol's sight line, which means the optic body sits higher on your body. In appendix and 3 o'clock positions, this can push the optic into your ribs or belt line. It's not a holster fault — it's geometry.
The fix is usually a slightly lower ride or a cant adjustment rather than a different holster. If you're changing positions anyway, do it before you buy anything.
Optics add height. Lights add width and length. Both together mean the holster has to accommodate a substantially bigger envelope, and the retention geometry has to grip a pistol that's been significantly modified from factory spec.
Most standard holsters will not handle both. If you're running a light and an optic, you need a purpose-built design — that's exactly what our Wide Body Holster is for.
| Optic class | Examples | Holster note |
|---|---|---|
| Full-size duty | RMR, RMR HD, SRO | Largest envelope — needs generous relief |
| Mid-size enclosed | Holosun EPS, 509T | Common carry choice; standard optic cuts usually clear |
| Micro / subcompact | 507K, RMRcc, Romeo Zero | Smallest profile; fits most optic-cut holsters |
Micro optics on micro-compacts are the easiest combination. Full-size optics on full-size slides are the hardest, because both the pistol and the optic are large.
Worth saying plainly: an optic is an advantage, not a requirement. Iron sights are simpler, require no battery, have no glass to obstruct, and work on any holster. If you're new to carry, there is no obligation to add a red dot. If you do add one, buy the holster for the configuration you'll actually carry.
Buy the holster for the pistol as you'll carry it, not as it came from the box. If you plan to add an optic, buy optic-ready. If you already have an optic, never buy a holster that doesn't explicitly say it's cut for one.
Our Original Holster accommodates most red-dot optics, which means you can add an optic without replacing your holster.
Only if it's cut for optics. Test it: holster the pistol and check for visible clearance above and around the optic. If the optic touches the holster anywhere, it isn't compatible.
Marginally. The optic adds a small amount of height and can catch on a shirt hem during the draw. Most people find the training benefit worth it, but be aware of the draw clearance issue.
Kydex can sometimes be reformed with heat, but the result is rarely as good as a purpose-molded holster and it can compromise retention. Buying an optic-cut holster is usually cheaper than the risk.
If you want backup irons to be usable, yes — a suppressor-height or co-witness sight. Many optics today co-witness with standard-height sights, so check your specific combination.
Only with a purpose-built holster. The combined envelope is much larger than either alone, and standard holsters won't accommodate both.
Veteran-owned. IWB or OWB, left or right hand, red-dot ready. $98.99 with a fit guarantee.
Shop the Original Holster — $98.99