Zenitco B-31L Upper Picatinny Rail for Sport-1
- $259
Available Options
In short: The Zenitco B-31L is the D16T upper Picatinny component for the Sport-1 interface. It fastens to the B-10L and DL-1 with eight supplied M5×7 screws.
Compatibility checkpoint
B-31L is documented for the B-10L plus DL-1 combination; these three components form the Sport-1 kit. The manufacturer lists AK-103, AK-104, AK-105, AK-74M, AKS-74, AKMS, AKM, Saiga-MK versions 33 and 30, Saiga-MK .223 Rem version 03, TG-2, Vepr-K, Vepr-KM and VPO-209. Confirm the exact lower interface before ordering.
Purpose and construction
The one-piece D16T component forms an upper Picatinny section above the gas system. Its eight-point screw connection depends on both the B-10L and DL-1; B-31L is not a stand-alone lower-interface replacement.
Technical specifications
| Material | D16T aluminum alloy |
|---|---|
| Interface | Upper Picatinny; mounts to B-10L plus DL-1 |
| Fasteners | Eight M5×7 screws |
| Weight | 116 ± 5 g |
| Dimensions | (200 × 50 × 37) ± 5 mm |
| Operating range | −50°C to +50°C |
| Manufacturer warranty | 60 months |
| Colors on this card | Black, desert or golden khaki |
What's in the Box
- B-31L upper rail in the selected color — 1
- M5×7 screws — 8
- User manual — 1
Installation note
After preparing the compatible B-10L and DL-1 assembly, align B-31L across both lower components and secure it with the eight supplied screws. Tighten the fasteners evenly and confirm that the assembly is seated without movement.
Frequently asked questions
What does B-31L mount to?
It mounts to the B-10L and DL-1 combination with eight supplied M5×7 screws.
Is B-31L part of Sport-1?
Yes. B-31L, B-10L and DL-1 together form the Sport-1 interface.
Can B-31L be installed by itself?
No. Its documented mounting path requires both B-10L and DL-1.
What is included?
One B-31L upper rail, eight M5×7 screws and one user manual.
General
Mounting & Rails
Kit Contents
Care & Chemicals
Reviews from customers
Used this product? Share your experience to help other customers choose.
