Battle Arms Development Sabretube QD Lightweight Stock Kit with QD Endplate, Black, Fits AR Rifles BTLARM The Battle Arms Development Sabertube is a butt stock that is perfect for keeping your rifle setup as lightweight as possible. Made from 7075-T6 aircraft grade aluminum" this stock is as durable as it is lightweight. This model features a built-in non-rotating QD point" a hard anodized finish" and is compatible with all standard AR-15 lower receivers. Battle Arms Development" Inc. (B.A.D. Inc.) is a design" research" and development firm incorporated in 2009 with a focus on small arms design including firearm components" tools" gauges" accessories" and complete weapon systems.