The BEV Block (Barrel Extension Vise) is an all-in-one, compact vise block tool for AR15/M4 assembly operations of barrel nuts, flash hiders, etc. Mounts securely in a vise and provides support for both billet and forged upper receivers. Engages barrel extension with solid steel lugs and full-length support shank to prevent flexing. Steel hardness is optimized for durability yet won't damage barrel extension, and Magpul Polymer is used for all other engagement surfaces to protect aluminum receiver. O-ring post uses bolt carrier for additional stability and included Pin keeps upper in the proper position.

• Type: Barrel Extension Vice
• Color: Black
• Material: Polymer
• Size: Mil-Spec
• Model: BEV
• Model Fit: AR-15, M4 ,M16
• Caliber or Gauge: 223 Rem,5.56 NATO

*Item must be returned in unused condition and in the original manufacturer's packaging (if applicable). If an item arrives non-defective and accurate to its description, this guarantee does not apply and returns will not be organized in those situations. Please confirm compatibility and specifications with us regarding item Magpul BEV Block Black Polymer w/ Steel before purchasing if you are unsure.