Akdas Alcor 1913 Picatinny Stock and AR Grip Adaptor light and resistant to the

light and resistant to the fluctuations in temperature it will experience as the firearm heats and cools

but covers 2

It features a small two slot rail cutout for backup iron sight fitment

As such there is no 'bottom' rail

Akdas Alcor 1913 Picatinny Stock and AR Grip Adaptor light and resistant to theMade from a solid piece of our high tensile Nylon polymer this adaptor is light, rigid and heat resistant. The adaptor is compatible with both the semi automatic and Australian import (button release) versions of the Akdas Alcor 223. Compatible with all standard non beavertail AR grips. The adaptor comes with its own hardware for installation, and additional hardware for grip compatibility. Made in Australia