This is a 100% small business set-aside solicitation for a firm-fixed-price purchase order to supply 30 Stop Blocks (NSN 1680-01-HR2-3856), with an option for up to 30 additional units. The requested delivery date is November 1, 2026, and the government may exercise optional quantity modifications for up to 365 days after award. All parts must be new, approved items, and the contractor must furnish a Certificate of Conformance; no drawings or specifications are available. Alternate parts are authorized only if approved by Medium Range Recovery Engineering and must satisfy all form, fit, and function requirements. The location for performance of services is not specified.