Intended use for attachment with mono pod shooting stabilizer on the Boyds At-One Gunstock. One-to-one modular component will exchange with a standard bottom cap. Dimensionally the same as the standard bottom cap with a 3-slot section Picatinny rail built in. The rail section is designed to be parallel to the bore. CNC machined aluminum with black anodization. Remove standard bottom cap and install new bottom cap with Picatinny rail section.