The Battle Arms Development Lightweight Stock is a minimalist style buttstock for a lightweight AR build. This is a fixed stock which clamps directly onto the end of SABERTUBE Receiver Extension/Buffer Tube. The Sabertube is compatible with most Mil-Spec carbine buffer and buffer springs. FeaturesClean, beautiful, no-nonsense, minimalistic design.Precision CNC from billet 7075-T6 Aircraft Grade AluminumMilSpec Type III Class 2 Hard Anodized BlackBuilt-In Non-Rotating QD