Zenitco B-81 Joker-1 Lower Handguard Rail for AR-15
- $349.00
-
Available Options
Zenitco B-81 Joker-1 Lower Rail
Genuine Zenitco | Joker system lower rail (Joker-1) for AR-15 | Weight 119 g
In short: the Zenitco B-81 is the lower half of the genuine Zenitco Joker modular free-float handguard for AR-15 carbines. It clamps to the Zenitco BN-1 titanium barrel nut and provides a continuous Picatinny (1913) rail for optics, sights and accessories. Part of the genuine Zenitco line.
Overview
The B-81 is the lower handguard bracket of the Joker 1 system for AR-15 platforms. It takes the place of the lower factory handguard half and carries a Bazis guide rather than fixed Picatinny.
That means accessories sit flat against the handguard, and Picatinny appears only where you clamp a B-2 or B-2U section. Milled from one piece of D16T aluminum with a black finish, with open construction that lets air at the barrel.
Compatibility Note: replaces the lower factory handguard on AR-15 platforms, as part of the Joker-1 system. Takes B-2 and B-2U Picatinny sections on its Bazis guide.
Compatibility: Zenitco Joker modular handguard system for AR-15; mounts on the Zenitco BN-1 titanium barrel nut. Joker-1 length class. Provides a Picatinny (1913) rail surface.
Key Advantages
- Genuine Zenitco Joker-system lower rail
- Full Picatinny (1913) rail for optics and accessories
- Precision CNC-machined D16T aircraft aluminum
- Lightweight at just 119 g
- Hard-anodized finish for corrosion resistance
Technical Specifications
| Brand | Zenitco |
| Type | Handguard rail (lower) |
| Material | D16T aluminum |
| Weight | 119 g |
| Dimensions (LxWxH) | 228 x 41 x 51 mm |
| Mounting | Picatinny (1913) |
| Fits | AR-15 (Zenitco Joker handguard system) |
| Operating temperature | -50°C to +50°C |
| MPN | Zen-B-81 |
| Condition | New |
In the Box
- 1 x Zenitco B-81 lower rail
- Mounting hardware
Frequently Asked Questions
What is the Joker system?
Joker is Zenitco's modular free-float handguard for AR-15 carbines. The upper and lower rails clamp onto the BN-1 titanium barrel nut to build a rigid, free-floating forend.
Does the B-81 fit any AR-15?
It is designed for AR-15 pattern carbines built with the Zenitco Joker barrel nut (BN-1). It is not a drop-in for standard AR handguards.
What does the B-81 replace?
The lower half of the factory AR-15 handguard, as part of the Joker 1 system.
Does it give Picatinny?
Not by itself. It carries a Bazis guide; B-2 and B-2U sections clamp onto it to form Picatinny exactly where you need it.
Do I need the matching upper bracket?
They are sold separately and normally run as a pair, but each half works on its own.
Is this a genuine Zenitco part?
Yes - it is an original Zenitco B-81 with guaranteed delivery.
Related: browse more genuine gear on the Zenitco brand page.
Genuine Zenitco B-81 lower handguard rail.
In Stock | Guaranteed Delivery | Original Zenitco Part
In Stock | Guaranteed Delivery | Original Zenitco Part
General
Mounting
Picatinny (1913)
Type
Handguard rail (lower)
Brand
Zenitco
Manufacturer Part Number (MPN)
Zen-B-81
Condition
New
Intended Use
AR-15 (Zenitco Joker handguard system)
Material
D16T aluminum
Weight
119 g
Dimensions (L x W x H) mm
228 x 41 x 51 mm
Operating Temperature
-50°C to +50°C
Mounting & Rails
Mounting
Factory lower handguard seat
Function
Bazis guide for B-2 and B-2U Picatinny sections
Recommended
Zenitco, B-81, Joker, AR-15, handguard rail