This JP-SPEC revision of the standard Mil-spec buffer tube improves on the original in both design and finish. We’ve included an addition stock position (for a total of seven) and given a finer surface finish for smoother function. This design is also designed to allow extra threading into the receiver which optimizes protrusion for use with our Silent Captured Springs. - Includes buffer tube lock ring and lock plate. - Addition stock position stop compared to standard Mil-spec 6-position design - Extra fine internal finishing for smoother quieter cycling and reduced buffer component wear - High quality exterior finish for reduced buttstock friction - Allowance for further insertion into lower receiver to optimize protrusion for use with Silent Captured Springs - Fully Mil-spec compatible - COLOR: Black - LENGTH: 7.25 in. - WEIGHT: 3.9 oz. (tube only) - MATERIAL: 7075-T6 aluminum - FINISH: Hardcoat anodizing