Most sourcing errors in precision optic accessories are not quality failures. They are
interface failures: a ring that will not close on a 34 mm tube, an adapter plate cut for the wrong
optic footprint, a rest interface that does not accept the customer’s existing rail. This selector turns
that guesswork into five ordered decisions, so a buyer can specify a complete, compatible package before
a single sample ships.
How to use this selector
Work top to bottom. Each step narrows the next one. Record your answer to all five steps, then send that
five-line summary with your inquiry — it is enough for our engineering team to quote without a second
round of questions.
Step 1 — Identify the host interface
Start with what the optic must attach to, not with the optic. The host interface decides the entire
mount family.
| Host interface | Slot / profile | Compatible mount family |
|---|---|---|
| Picatinny (MIL-STD-1913) | 5.23 mm slot, 0.394'' pitch | Widest range; most one-piece and two-piece bases |
| Weaver | 3.8 mm slot, no fixed pitch | Weaver-cut rings; Picatinny clamps often fit, reverse rarely does |
| 11 mm / 3/8'' dovetail | Tapered dovetail | Dovetail rings or a dovetail-to-Picatinny riser |
| M-LOK / KeyMod | Negative-space attachment | Accessory rail sections and direct-attach bipod adapters |
| Arca-Swiss | 38 mm dovetail | Clamp-on rests, tripod plates, stabilization rails |
Direction matters: a Picatinny-cut clamp usually seats on Weaver, but a Weaver-cut ring will not index
into Picatinny recoil slots. If your programme mixes both, specify Picatinny-cut and gain reverse-direction fit.
See our Rails range and the
rail compatibility guide.
Step 2 — Match the optic body
Now measure the optic, not the box it came in.
| Optic type | Critical dimension | What to order |
|---|---|---|
| Tube-body magnified optic | Tube diameter: 1'' / 30 / 34 / 35 mm | Matching ring bore — never shim a larger bore down |
| Compact reflex sight | Base footprint pattern | Footprint-specific plate, or a footprint-agnostic adapter line |
| Prism or fixed-power unit | Integrated base type | Riser or spacer to reach eye line |
| Clip-on front unit | Objective outer diameter | Front rail section plus clamp of matching bore |
Footprint fragmentation is the most expensive variable in a reflex-sight programme. Consolidating onto one
adapter family is usually cheaper than stocking five plates — the logic is the same as the
Arca-Swiss consolidation case.
Browse Optics and Mounts & Rings.
Step 3 — Set height and clearance
Ring height is a clearance calculation, not a preference. Objective outer diameter, plus the shortest
acceptable gap, minus the rail top surface, gives the minimum centre height.
| Objective size | Typical height class | Notes |
|---|---|---|
| Up to 32 mm | Low | Lowest sight line; verify the turret housing still clears |
| 36–44 mm | Medium | The default for general shooting sports use |
| 50 mm and above | High / extra high | Check the bell taper, not just the maximum diameter |
| Any, with a raised sight line | Cantilever or riser | Confirm eye relief before fixing the height class |
Height also drives repeatability: excess stack height amplifies any torsional flex. Details in
ring height and return-to-zero.
Step 4 — Fixed or quick-detach
Choose by workflow, not by price.
- Fixed base — the optic stays on the host platform. Fewest moving parts, lowest cost per unit, best absolute rigidity. Correct for most single-configuration programmes.
- Quick-detach (QD) — the optic is removed between sessions, transported separately, or shared across platforms. Specify a repeatable-zero lever design and state your acceptable return-to-zero tolerance in the inquiry.
If a distributor’s customers move one optic across several platforms, QD is not a premium add-on — it
is the requirement. Background in
standardizing on QD mounts
and choosing rings and mounts.
Step 5 — Add the stabilization interface
The last step is what the platform rests on. Decide the attachment first, then the leg format.
| Support need | Attachment | Format |
|---|---|---|
| Field and hunting use | Sling stud or M-LOK | Folding bipod, cant and pan adjustable |
| Bench and match use | Arca-Swiss clamp | Wide-footprint rest or tripod plate |
| Mixed fleet | Picatinny adapter | Quick-detach bipod with adapter kit |
See Stabilization and the
bipod buying guide for material, cant and lock-up detail.
Master matrix — four common buyer profiles
| Profile | Host | Optic | Mount | Support |
|---|---|---|---|---|
| Hunting distributor | Picatinny / dovetail | 1''–30 mm tube, 42 mm objective | Medium two-piece rings | Folding sling-stud bipod |
| Shooting sports retailer | Picatinny | 34 mm tube, 56 mm objective | High one-piece, 20 MOA option | Arca-Swiss rest |
| Reflex-sight programme | Picatinny | Multiple reflex footprints | Footprint-agnostic adapter line | Not applicable |
| OEM / ODM buyer | Customer drawing | Customer optic | Custom base to print | Optional matched rail |
B2B specification checklist
Before a quotation, have these ready. Each one removes a revision cycle:
- Material and finish: 6061-T6 or 7075-T6 aluminium alloy, hard-anodized; steel or titanium fasteners.
- Tolerance expectation on bore and slot, and the torque values you want documented.
- Quantity per SKU and total programme volume — this sets tooling amortization, not just unit price.
- Branding: laser mark, own-label packaging, multi-language insert requirements.
- Certification and documentation set required by your import market.
- Target lead time and whether a first-article inspection is needed before mass production.
Capability detail is in OEM/ODM capabilities, and market
documentation guidance in the export compliance notes.
Terminology is defined in the
optical mounting and sighting glossary.
Three mismatches to avoid
- Bore assumed from brand, not measured. A 30 mm and a 34 mm tube look similar in a photo. Measure, then order.
- Height chosen before eye relief. Fixing the height class first forces an uncomfortable sight line later.
- Support interface left to the customer. A rest that cannot clamp the supplied rail turns a good optic package into a return.
Send us your five lines
Reply with your five answers — host interface, optic body, height class, fixed or QD, support
interface — and we will return a matched configuration with MOQ, tooling status and lead time.
KRS supplies tactical mounting systems, precision optic accessories and
outdoor optics to distributors and OEM/ODM programmes.
WhatsApp (fastest): chat with our B2B team
RFQ / quotation: request a quotation — include target quantity, destination market and any drawings.
Explore the full range: Optics ·
Mounts & Rings ·
Rails ·
Stabilization ·
Distributor programme