Zenitco B-31U/RPK Extended Upper Picatinny Rail
- $419
Available Options
In short: Zenitco B-31U/RPK is an extended D16T upper rail for the documented RPK-pattern interface group. It works with B-20L or B-20U, B-23L and DL-5, and is secured with ten supplied M5×7 screws.
Purpose
B-31U/RPK forms an extended upper Picatinny surface while preserving the mechanical sight line. The manufacturer also documents it within Sport-5U and Sport-8U configurations.
Technical specifications
| Material | Milled D16T aluminum alloy |
|---|---|
| Required component group | B-20L or B-20U, plus B-23L and DL-5 |
| Documented kit paths | Sport-5U and Sport-8U |
| Overall dimensions | 270 × 47 × 42 mm, tolerance ± 5 mm |
| Weight | 182 ± 5 g |
| Fasteners | 10 supplied M5×7 screws |
Compatibility
The manufacturer documents B-31U/RPK for RPK and related civilian-platform configurations using the required component group above. It is not a substitute for B-31, B-31S or B-31LN.
Choose the correct B-31 version
| B-31 V2.0 | 185 ± 5 mm rail; full-size 415 mm configuration |
|---|---|
| B-31S V2.0 | 170 ± 5 mm rail; B-30 or B-30U interface |
| B-31LN | B-21L + DL-2 interface for Saiga-9 |
| B-31U/RPK | extended RPK-pattern interface group |
These versions are not interchangeable by appearance alone. Match the required lower interface and platform configuration before ordering.
Colors
The current Bazalet selection offers Black and Desert as required options.
Delivery basis
- B-31U/RPK upper rail — 1
- M5×7 screws — 10
- User manual — 1
Installation
Assemble B-31U/RPK only with the documented lower components and DL-5, then secure all ten M5×7 screws evenly. Follow the current manufacturer manual and verify the complete assembly before attaching accessories.
Frequently asked questions
Can B-31U/RPK be used with B-30?
No. Its documented lower component group is B-20L or B-20U with B-23L and DL-5.
Which complete kit paths include this version?
The manufacturer documents B-31U/RPK within Sport-5U and Sport-8U configurations.
What's in the Box
Frequently Asked Questions
General
Mounting & Rails
Care & Chemicals
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