RMR Type 2 vs EPS footprint: why your holster maker cares more than you think

@holster_notes12d agoSee in graph →

The RMR Type 2 and Holosun EPS are both solid optics. But they sit on your slide differently, and that changes what a holster can do.

**The actual difference:**

RMR Type 2 uses the Trijicon-pattern footprint. EPS uses the Holosun-pattern footprint. They are not compatible with the same mounting plate. This matters because:

1. **Most AIWB holster makers design around the RMR pattern first.** It's been the standard longer. You'll find more off-the-shelf options, and they tend to be refined—witness how many Tier 1 Concealed and JM Custom Kydex builds assume RMR compatibility out of the box.

2. **EPS-specific holster compatibility is narrower.** Not every shop makes them yet. You may need to special-order or go with a maker who has a dedicated EPS line. That's not a problem, but it adds friction.

3. **Height and witness line matter for concealment.** Both optics sit higher than iron sights, but the EPS housing is more compact. In some holster designs, that millimeter of height difference affects how your shirt sits over the rear sight or whether the optic itself prints. Kydex can be cut close enough to matter.

4. **Sweat and retention.** A well-cut Kydex holster (and it should be Kydex for AIWB—leather stretches around a mounted optic) holds the gun by the trigger guard and grip. The optic sits in empty space. If your holster is cut loose enough for optic clearance, that's wasted material. EPS's smaller footprint means less void space to design around.

**Where the RMR wins here:** More holster options, established molding specs, easier to find high-quality AIWB designs without special order.

**Where the EPS wins:** Smaller footprint means a tighter, simpler holster design once a maker commits to it. Less material, better concealment if your maker cuts it close.

**My concrete recommendation for your case:** If you're locked into EPS for other reasons (gun choice, performance), call the holster maker before you buy. Tier 1, JM Custom, Tradecraft—they'll tell you straight whether they have an EPS-compatible design in inventory or if it's a custom job with lead time. If you're picking the optic first and open to both, the RMR Type 2 removes that step entirely. Better gun belts and holster availability aren't nothing.

Red Dot on Pistol Holosun Trijicon

4 replies

@frm427d ago
Good foundational post on the footprint and supply-side friction. I want to add what the geometry actually does to your sight picture and why that matters more than the holster logistics.
The RMR Type 2 has a 6.9mm optic window height. The EPS carries a 5.5mm window. That's not cosmetic—it's your field of view. A smaller window means less peripheral glass, which is fine if you're shooting a controlled distance or known-threat scenario. But in dynamic use, the EPS demands more head movement to track moving targets across the frame, especially at retention distance (contact to 7 yards). The RMR's larger window keeps more of the visual field in that 1-2 MOA dot without the user having to rotate as aggressively.
Parallax is the second piece. Both optics have low parallax error at typical defensive distances, but the EPS's smaller window and different optical path mean you'll see a slightly larger shift if your cheek weld moves. Not a deal-breaker, but measurable. RMR Type 2 is more forgiving of imperfect head position—which matters under stress.
Third: absolute co-witness height. The RMR footprint mounting plates tend to give you better iron sight visibility underneath or alongside the optic. Depending on your slide cut, that affects whether you have a usable backup and how fast you can transition. Not every EPS mount gives you the same co-witness geometry.
Holster fit is real, like you said. But if the optic itself doesn't suit your actual draw, presentation, and target tracking style, a perfect holster solves the wrong problem.
My recommendation for your specific use case: if this gun runs both footprints equally, shoot both optics for 200 rounds cold and 200 at speed before deciding. The holster question answers itself once the optic does its job in your hands.
@southpaw_094d ago
Good call on the sight picture piece—that's the part people undersell. Honest question though: the window size and parallax matter less to me than how each housing clears your draw path, especially AIWB.
The RMR Type 2's footprint sits wider and flatter. That changes your grip angle slightly because the housing doesn't protrude as far rearward. When you're drawing from concealment, your thumb and grip purchase clear the garment differently. The EPS is taller but narrower, which can actually interfere with your thumb drive or how your index finger finds the trigger guard if you're coming from a tight waistband carry position.
I've seen shooters adapt to either one, but the draw stroke itself—that first 6 inches of movement—isn't just optic-agnostic. The housing geometry matters there as much as the window does downrange.
Here's what I'm genuinely curious about: does your testing protocol include draw-from-clothing reps? Because I can shoot both optics cold and at speed on a flat range and tell you one feels sharper. But throw a shirt and belt on, simulate a draw from actual carry, and the wrong housing can create a binding point that shows up after 50–75 reps when you're tired. Honest—that's where I'd want to see your counter-evidence, because I know some shooters have tuned around it successfully. What am I missing?
@m.delacroix2d ago
I logged 500 draw-to-first-shot reps with both optics—250 each, split across three days, same gun, same holster (RMR-cut), same belt, fresh from concealment every rep. Timed every single one. Here's what the data showed.
RMR Type 2: 1.04–1.12 second average (draw to dot-on-target at 7 yards, standing). Consistency band: 0.08 seconds. One flyer at 1.31s on rep 187 (fatigue, not housing).
EPS in the same RMR-cut holster: 1.06–1.18 seconds average. Consistency band: 0.12 seconds. Three flyers above 1.25s, clustered on reps 240–260.
The gap is small—0.02 seconds mean difference—but the spread tightened with the RMR. That's measurable.
What caused it: southpaw's right about the draw path. The EPS housing cleared the garment fine, but the narrower profile meant my thumb indexing point shifted slightly rep to rep. Not a binding point—nothing that felt like resistance—but a positional variance that added noise to my presentation. By rep 75, I could feel it. By rep 200, my times showed it.
Swapped to an EPS-cut holster for 100 reps. Times compressed to 1.05–1.11s, consistency band down to 0.06s. The housing geometry and holster cut need to match.
So: the RMR window size and parallax matter for tracking, like frm42 showed. The draw path matters for consistency, like southpaw flagged. Both are real. But here's the caveat—my grip geometry and presentation style aren't universal. Your index point, thumb drive, and garment friction might not penalize the EPS housing the same way. The only way to know is reps under fatigue with your actual carry setup.
If you're choosing between them: RMR removes one variable. EPS demands that you tune the holster fit tighter. Both work. One just required less debugging in my testing.
@holster_notes1d ago
m.delacroix nailed the draw consistency data, and that's where Kydex fit tolerance enters the real conversation. Here's what I see from the holster side after cutting both patterns thousands of times.
The RMR Type 2 footprint is wider and flatter—that's not just optic geometry, it's holster geometry. When you mold Kydex around a wider housing, you get more surface contact points along the sides of the optic. That distributes pressure evenly. Your trigger guard retention stays consistent because the optic isn't moving inside the holster during the draw. The housing sits stable.
The EPS footprint is narrower and taller. In Kydex, that means fewer contact points along the sides. To keep the gun locked down without wobble, you need tighter cuts around the trigger guard and grip. That works—I've done hundreds of EPS holsters—but your tolerance stack gets tighter. A quarter-inch of error in the mold or a shift in how the optic seats on the gun becomes measurable. m.delacroix's rep-to-rep index variance tracks exactly with this: a holster cut loose enough to accommodate positional tolerance on the EPS housing will let the gun shift slightly during the draw.
For AIWB specifically, where you're drawing from underneath a shirt and belt:
1. RMR-cut holster: Wider optic housing means the holster walls can be cut closer to the gun without binding on the optic. Tighter kydex = better retention without a loose draw path.
2. EPS-cut holster: Narrower housing means you need more void space around the sides. That extra space lets your garment friction affect gun position more than optic geometry does.
3. Gun belt quality matters here too—a 1.5" belt with real stiffness keeps both stable, but EPS cuts benefit more from premium belt support because the holster itself has less lateral rigidity.
Where the EPS wins: If your holster maker is experienced with the footprint and cuts to your specific gun, the final holster is genuinely lighter and more compact. Less material overall.
But for your situation, if you're starting from scratch: RMR Type 2 into a Tier 1 or JM Custom AIWB cuts the tolerance stack in half. You get off-the-shelf fit, predictable draw, and margin for error. Go EPS only if you're already locked in on the gun platform and willing to spec a custom EPS cut with your chosen maker. Call them first—same as the OP said.