Material:aircraft aluminum T6 6061
Length : 12.6 inch
Very easy to install (tool included)
Color : Black
Quad Rail Handguard
Front end cap  Optional
For  .223/5.56 (AR15) Types
Free Floating Quad Rail Mounting System
Free float design, allowing for direct mount to the receiver
Picatinny on all 4 sides rails(21mm)

Barrel nut inside hole diameter: 1.02 in (26mm)
Barrel nut outside diameter: 1.84 in (46.83 mm)
Barrel nut mounting thread spec.: 1-1/4-18 UNC

Front End cap inner diameter:  1.04 in (26.3mm)

12.6'' Quad Handguard Rail:

Dimensions: 12.6'' (Length ) x 2.5'' x 2.5 (Width)

Light weight in precision

Easy and quick installation

High quality aluminum alloy in durable black matte finish

Fit .223 Rifle and Variants

Package:
One quad rail+barrel nut + jam nut+wrench+Front end cap (Optional)
Carton package size:
13 inch x 3 inch x 3 inch

Model :

M16-12BCA (Black) With Front end cap
M16-12B (Black) Without Front end cap