Zenitco B-74 Joker-4 Upper Picatinny Handguard
- $449
Available Options
In short: The Zenitco B-74 is the upper component of the Joker-4 handguard system for the AR-15 platform. It provides a continuous top Picatinny rail and secures to the matching B-84 lower component with four screws.
Compatibility checkpoint
B-74 is designed for the Joker-4 configuration and pairs with the B-84 Joker-4 lower handguard. The complete installation also uses the Zenitco mounting nut and a compatible adjustable gas block. B-74 is not a standalone replacement for a standard upper component.
Purpose and interface
The one-piece milled component replaces the standard upper position and creates a continuous Picatinny surface when aligned with the receiver rail. Its open profile reduces unnecessary mass and supports airflow through the assembled interface.
Technical specifications
| Documented platform | AR-15 with the matching Joker-4 system components |
|---|---|
| Required lower component | B-84 Joker-4 |
| Material | D16T aluminum alloy, one-piece milled construction |
| Accessory interface | Continuous top Picatinny rail |
| Weight | 143 +3 g |
| Dimensions | 368 × 39 × 38 mm |
| Operating range | −50°C to +50°C |
| Manufacturer warranty | 60 months |
| Color | Black |
Delivery basis
B-74 Joker-4 upper handguard — 1.
Installation note
The documented procedure first installs and aligns the B-84 lower component with the system mounting parts. B-74 then seats in the B-84 grooves and is secured with four screws. Professional installation is recommended when the complete Joker-4 interface has not already been confirmed.
Frequently asked questions
Is B-74 a complete Joker-4 system?
No. It is the upper component and requires the matching B-84 lower component plus the related Joker-4 mounting parts.
Which lower component matches B-74?
The matching lower component is the Zenitco B-84 Joker-4.
What accessory interface does B-74 provide?
A continuous top Picatinny rail.
How is B-74 attached?
It seats in the B-84 grooves and is secured to the lower component with four screws during the documented system installation.
What's in the Box
General
Mounting & Rails
Kit Contents
Care & Chemicals
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