The Streamlight ProTac Rail Mount 1L-X USB Weapon Light is a compact SBR/carbine weapon light — the rechargeable-ready package that ships with the SL-B9 battery pack and USB cord, unlocking the full 850 lumens and 30,000 candela (346m). A CR123A works as backup (500 lm).
Simple push-button tail switch, TEN-TAP programming, and Picatinny plus M-LOK mounting. 6000-series black anodised aluminium, IP67, 4.64in.
How It Compares
CR123A package instead? The 1L-X (89026). Need a remote pressure switch? The 1L-X USB Pro (89025). Browse all weapon lights and our lumens vs candela chart.
Ideal For
- SBRs, carbines and compact long guns
- Rechargeable full-output setups
- Clean tail-switch builds
Key Features
- 850 lm / 30,000 cd / 346 m (SL-B9 included)
- 100 lm / 3,400 cd / 117 m low; TEN-TAP programmable
- Push-button tail switch
- Picatinny rails plus M-LOK mount included; IP67
- SL-B9 rechargeable pack and USB cord in the box
Technical Specifications
| Output (SL-B9) |
850 lm / 30,000 cd / 346 m (0.5 h); 100 lm / 3,400 cd / 117 m low (4.5 h) |
| Output (CR123A) |
500 lm / 18,000 cd / 268 m (1.75 h); 100 lm low (6.5 h) |
| Strobe Runtime |
1.25 h (SL-B9) / 2.5 h (CR123A) |
| Battery |
1× SL-B9 USB rechargeable (included) or 1× CR123A |
| Mount |
MIL-STD-1913 Picatinny; M-LOK mount included |
| Length / Weight |
4.64 in (11.79 cm) / 5.22 oz with SL-B9 (5.12 oz with CR123A) |
| Construction |
6000-series machined aircraft aluminium, black anodised |
| Durability |
IP67 (1 m, 30 min) with tail switch |
| SKU / MPN / UPC |
89027 / 89027 / 080926890275 |
| Warranty |
Streamlight Limited Lifetime |
What's Included
- ProTac Rail Mount 1L-X USB weapon light
- Tailcap switch, mounting hardware, M-LOK mount, SL-B9 battery pack, USB cord
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Streamlight's limited lifetime warranty.
Frequently Asked Questions
USB or standard package?
Identical light — the USB (89027) includes the SL-B9 rechargeable pack and cord for full 850-lumen output out of the box.
How does it charge?
The SL-B9 pack charges via USB using the supplied cord.
What rails does it fit?
Picatinny, plus M-LOK using the supplied mount.
