The American Defense MFG spacer for mounting an Aimpoint CompM4 on the modular AD-B2 Base. Description The B2-CM4SOCOM Riser is designed to interface with the B2 modular base is configured for the Aimpoint Comp M4. It will put the iron sights in the lower third of the optic. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. Materials & Construction The B2-CM4SOCOM Riser is precision CNC machined from a block of 6061 T6 aluminum and finished in hard coat type 3 Mil-Spec anodize for a rock hard lasting finish. Precision machined from 6061 T6 Aluminum. Hard coat anodized for a lifetime of performance. American Defense MFG, LLC. products feature a lifetime warranty. Made with pride in the U.S.A. Specifications The B2-CM4SOCOM Riser has the following specifications: Weight: 1.25 ounces