ALS and SLS describe different security mechanisms. RDS describes an optic-oriented holster design, while QLS is a mounting system. These labels answer different questions, and none by itself verifies compatibility or a duty rating.
ALS vs. SLS: what do the abbreviations mean?
ALS means Automatic Locking System. Safariland describes it as an internal mechanism that secures the firearm on holstering. SLS means Self Locking System and uses a rotating hood. Some models combine both systems; for example, Safariland identifies the 6360 and 7360 as ALS/SLS duty holsters.
What do Safariland retention levels mean?
Safariland’s duty ratings are based on its own testing and the distinct hand motions needed to clear security mechanisms. Its duty-rated Level III designs commonly combine ALS and SLS. Ratings and tests vary across manufacturers; verify the exact configuration, mounting equipment and your agency’s policy rather than assuming all Level III holsters are equivalent.
RDS, RDSO, RDSC and DO
RDS refers to red-dot-sight compatibility. RDSO means Red Dot Sight Open, an open optic area without a top cover. RDSC means Red Dot Sight Cut, a compact optic-accommodating design. DO refers to an earlier Docter Optic designation. Exact optic and firearm compatibility varies by model and configuration; check Safariland’s current fit information.
What is QLS?
QLS is the Quick Locking System: a mounting interface rather than a holster retention rating. Safariland describes a QLS 19 fork and QLS 22 receiver as a full assembly. Verify which pieces are included before ordering.
Which option should you choose?
Start with your organization’s policy and required duty rating, then confirm the exact firearm, mounted accessories, draw hand, belt and mounting setup. Inspect pre-owned equipment and confirm condition. Ask for help when a label or configuration is unclear.
Continue with our 6000 vs. 7000 model family guide or part-number breakdown.
Retention terminology at a glance
| Term | What it describes | What to verify |
|---|---|---|
| ALS | Automatic Locking System | Exact model and published rating |
| SLS | Self Locking System with rotating hood | Hood and hardware condition |
| ALS/SLS | A combination of mechanisms on certain models | Complete model, configuration and rating |
| RDS / RDSO / RDSC | Optic-oriented design terms | Specific optic and configuration |
| QLS | Quick attachment system | Included fork, receiver and mount |
Safariland duty ratings: Level I through IV
Safariland says its duty-rated holsters must pass its own testing while attached to an approved mounting device and duty belt. It does not count passive retention as a retention level. Its examples include ALS for Level I; SLS alone or ALS with an ALS Guard for Level II; ALS plus SLS for Level III; and an ALS/SLS combination with Sentry for Level IV. These descriptions are manufacturer-specific and are not a substitute for the rating on an individual product.
Accessories must be compatible with the particular holster. Do not assume an accessory is present or that a rating changed merely because a listing mentions a mechanism. For a used holster, request detailed photos and confirmation of the parts installed.
What is the difference between a hood guard and a Sentry?
Safariland describes the hood guard as protection for the SLS mechanism, while the Sentry provides an additional security device. Its Model 6002 combines those accessories. Check manufacturer compatibility and the rating for the complete assembly before making a purchasing decision.
QLS components and part-number suffixes
The QLS 19 fork and QLS 22 receiver are separate components. Safariland gives the example of a complete assembly specified with an -MS30 suffix on certain orders. A QLS fork alone is not the entire assembly; ask whether the receiver, belt attachment and required hardware are included. Mounting arrangements must also meet your organization’s policy.
Frequently asked questions
Does ALS automatically mean Level III?
No. ALS appears on multiple designs and Safariland also lists duty-rated Level I ALS models. Check the exact product and rating.
Does optic-ready mean every red dot fits?
No. Optic dimensions and configuration matter. Confirm the exact model and setup against current manufacturer information.
Is QLS a retention level?
No. QLS refers to an attachment system; holster security mechanisms and duty ratings are separate considerations.
Manufacturer sources
- Safariland: holster part numbers
- Safariland: holster retention
- Safariland: optic acronyms
- Safariland: QLS
Reviewed October 27, 2026. HolstersMaster is not affiliated with Safariland. Product availability and configuration are subject to confirmation.