The Black Rain 12" Free Float Quad rail is constructed of 6061 T6 aircraft grade aluminum, while the collar is made of 2024 aluminum. The screws are made from high carbon steel which is then dipped in black zinc which require no tools for installation.

Specifications and Features:
Black Rain Ordnance BRO-FFR-R-BLK-308
12" rifle length
Quad rails
Free float
Black
Blacked out "T-marks", with 100% backwards compatibility
Quick detach swivel cup
Hard coat type III class 2 anodizing MIL-A-8625
14.8 oz. installed
Made in the USA

Fits:
.308 AR Rifles