XM15-E2S STRIPPED LOWER REC Manufacturer Model Number: F1003308 Manufacturer: Bushmaster Model: XM15-E2S Lower Caliber: 223 Rem | 5.56 NATO Type: Accessory-Lowers Item Type: Firearm Finish: Matte Black Weight: .52 lbs. Shipping Weight: 0.6 Feature: 1/4x28 Tension Screw Optic Adjustable Objective: false Optic Reticle Illuminated: false