Zenitco B-31RPK Upper Picatinny Rail for Sport-5 and Sport-8
- $289
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In short: The Zenitco B-31RPK is a CNC-milled D16T aluminum upper Picatinny rail for RPK platforms and their documented commercial variants. It completes the upper section of a Sport-5 or Sport-8 configuration and requires DL-3 together with the matching lower component.
Compatibility matrix
| Configuration | Required lower component | Required extension | Documented platform |
|---|---|---|---|
| Sport-5 | B-20L | DL-3 | RPK and documented commercial variants |
| Sport-8 | B-23L | DL-3 | RPK and documented commercial variants |
Required assembly: B-31RPK is not presented as a standalone upper rail. Match it with B-20L + DL-3 for Sport-5, or B-23L + DL-3 for Sport-8.
Technical specifications
- Material: CNC-milled D16T aluminum alloy
- Interface: upper Picatinny rail
- Dimensions: 193 × 45 × 42 mm, tolerance ±5 mm
- Weight: 130 g, tolerance ±5 g
- Finishes: Black and Desert
Installation overview
- Install the matching B-20L or B-23L lower component.
- Position B-31RPK above the matching assembly.
- Install DL-3 and the associated Tie Bar-2 plates.
- Use the documented fastener positions across the assembled system and tighten evenly.
- Confirm alignment and unobstructed use of the original mechanical sight line.
What's in the Box
| B-31RPK upper rail in the selected finish | × 1 |
| M5×7 screws | × 6 |
| Operating manual | × 1 |
Frequently asked questions
Which components are required for Sport-5?
Use B-31RPK with B-20L and DL-3.
Which components are required for Sport-8?
Use B-31RPK with B-23L and DL-3.
Is B-31RPK a standalone upper rail?
No. The documented configuration uses the matching lower component and DL-3.
What is supplied with B-31RPK?
One B-31RPK upper rail, six M5×7 screws and one operating manual.
Zenitco Specs
Component type
Upper Picatinny rail
General
Product type
Forms the upper Picatinny section of Sport-5 or Sport-8
Brand
Zenitco
Condition
New
Material
CNC-milled D16T aluminum alloy
Color / Finish
Black; Desert
Weight
130 g ±5 g
Dimensions (L x W x H) mm
193 × 45 × 42 mm ±5 mm
Mounting & Rails
Mounting method
Sport-5: B-20L + DL-3; Sport-8: B-23L + DL-3
Rail Type
Upper Picatinny rail; requires DL-3 and matching lower component
Function
RPK; documented commercial RPK variants
Kit Contents
Includes
B-31RPK ×1; M5×7 screws ×6; operating manual ×1
Care & Chemicals
Resistance
Not a standalone upper rail; B-20L and B-23L belong to different documented configurations
Compatible platforms / hosts
RPK and documented commercial RPK variants in Sport-5 or Sport-8 configuration
Required interface / configuration
DL-3 plus B-20L for Sport-5 or B-23L for Sport-8; six supplied M5×7 screws
Resulting interface / function
upper Picatinny rail for the complete Sport assembly
Exclusions / limitations
standalone installation and mixing the Sport-5 and Sport-8 lower-component paths
Customer feedback
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