The Sharps Bros The Jack Stripped Lower is machined from 7075-T6 aluminum, offering a durable black anodized finish. This lower receiver features a threaded bolt catch pin and improved styling. It includes an oversized and integral trigger guard, a beveled magazine flare, and a multi-caliber mark. The Jack is fully compatible with all mil-spec internal parts and aftermarket mil-spec upper receivers, as well as GI standard issue magazines and PMags.Key FeaturesMaterial: Constructed from 7075-T6 aluminum for enhanced durability.Compatibility: Fully compatible with mil-spec internal parts and aftermarket upper receivers.Trigger Guard: Features an oversized and integral trigger guard for added functionality.Magazine Flare: Includes a beveled magazine flare for easier magazine insertion.Multi-Caliber Mark: Marked for multi-caliber use.NOTE: Requires a lower parts kit, buffer, and stock of your choosing to complete.