The Mod 1 is a drop-in replacement buttstock for AR-15/M16 carbines using Mil-Spec receiver extensions. This carbine stock is made from durable reinforced polymer that can withstand hard impacts and includes QD sling attachment points on either side, so you can attach your favorite sling. It also features an angled buttpad that makes shouldering your rifle easier when wearing a plate carrier. The enhanced locking mechanism makes changing the length of pull fast and easy while reducing the risk of accidentally pressing the unlock lever.