The VLTOR RCVR EXT AR-10/A5 S RAIL is a premium receiver extension designed for Mil-Spec dimensioned M4/AR-15 type collapsible stocks. This six-position receiver extension is made from durable impact extruded 7075 T6 aluminum and features a hard coat anodized finish, ensuring longevity and resistance to wear. The positions are clearly numbered and visible through the witness hole on most stocks, allowing for easy adjustments. This receiver extension is also compatible with AR-10 rifles, making it a versatile choice for your AR platform. Upgrade your setup for improved functionality and enhanced performance in the field or at the range.