This is a total small business set-aside, single-award Firm-Fixed Price IDIQ contract for the M4A1 Lower Marking Receiver, with a five-year term and delivery orders placed as requirements arise. The minimum guaranteed quantity is 726 units, with a maximum of 21,638 units over the five years. First Article Testing is required, and the associated Technical Data Package is restricted to DoD and U.S. DoD contractors. Military Packaging Level B with special packaging instructions applies, and all shipments are FOB Destination to Anniston, Alabama. Offerors must complete all required solicitation fill-ins and representations to be eligible for award.