Day & Zimmermann Lone Star LLC

Day & Zimmermann Lone Star LLC, a for-profit limited-liability-company subsidiary of Day & Zimmermann headquartered in Texarkana, Texas, manufactures ammunition components and munitions for the Department of Defense as a prime contractor on single-award indefinite-delivery contracts, competing under full-and-open (no set-aside) procurement. The vendor operates a portfolio of 70 prime awards (71% of recent activity) valued at $2.24 billion combined potential value, with a secondary subcontractor footprint of 28 sub awards (29%) supplying primers and ammunition components to major primes.

Day & Zimmermann Lone Star's customer base concentrates heavily on Department of Army ammunition procurement. The top four funding agencies account for 94% of awards by count, led overwhelmingly by the Department of the Army Acquisition Support Center PEO Ammunition, which accounts for 67 awards carrying $2.14 billion in combined potential value—approximately 96% of the vendor's total portfolio. The Department of the Navy Naval Sea Systems Command, the Department of the Army Materiel Command Joint Munitions Command, and the Department of the Army Headquarters Office of the Chief of Staff complete the active set with much smaller footprints ($48.5 million, $26.3 million, and $13.5 million respectively). This concentration reflects the vendor's core role as a sole-source or primary supplier of specialty munitions items for which Day & Zimmermann Lone Star holds exclusive manufacturing capability.

The vendor's capability portfolio spans ammunition recapitalization, percussion primer and electric primer manufacturing, fuze production, grenade manufacturing, and 155mm combustible cartridge case assembly. Representative prime work includes a $966.7 million single-award indefinite-delivery contract (awarded September 28, 2023, running through September 27, 2028) for manufacture, assembly, inspection, packing, and delivery of 155mm MACS M231/M232-series combustible cartridge cases, from which a $238.9 million delivery order issued on the same date for Ukraine production capacity; a $40.3 million single-award indefinite-delivery contract (awarded June 23, 2023) for 120mm M830A1 ammunition recapitalization, encompassing disassembly, component replacement, and refurbishment of up to 40,000 cartridges; and a $32.3 million single-award indefinite-delivery contract (awarded September 28, 2023) for M28B2 percussion primer production. Recent delivery orders under these vehicles total $13.6 million for 120mm M830A1 and M908 ammunition recapitalization (awarded July 16, 2026, ultimate completion September 1, 2028), $30.9 million for M82A1 percussion primers (awarded July 30, 2025, ultimate completion April 30, 2028), and $33.8 million for M201A1 MOD 3 and M201A1 hand grenade fuzes (awarded September 26, 2024, ultimate completion December 31, 2027). Smaller-dollar work includes signal cartridge procurement under an $8.68 million indefinite-delivery contract running through October 31, 2027, and grenade consolidation orders under a $311 million indefinite-delivery contract consolidating grenade and fuze manufacturing.

Activity has grown sharply over the past three years—from 3 awards in 2022 to 21 in 2025—driven primarily by Ukraine-related munitions demand and near-term Army ammunition stockpile requirements. The vendor faces a recompete cliff of eight awards carrying combined potential value of $354.4 million with ultimate completion dates within the next twenty-four months, representing material recompete exposure concentrated in the M28B2 percussion primer and 120mm M830A1 recapitalization contracts.

Day & Zimmermann Lone Star subcontracts primers and specialized ammunition components to General Dynamics Ordnance and Tactical Systems (the largest sub prime by activity frequency, receiving detonating-insensitive fuzes, electric primers, and benite cutting services across multiple 120mm tank-ammunition platforms including M829A4 armor-piercing fin-stabilized discarding-sabot-with-tracer cartridges and IM HE-T munitions), Northrop Grumman Systems Corporation (120mm tank training ammunition and M1002 ammunition-can refurbishment work), and Alliant Techsystems Operations LLC (120mm advanced-multi-purpose XM1147 high-explosive-multi-purpose-with-tracer ammunition cartridge manufacturing). On the prime work side, Day & Zimmermann Lone Star engages subcontractors including Alta Max LLC, an SBA-certified HUBZone small business providing packaging for MK4 Mod 3 signal cartridges, and Hydrite Chemical Co (Lacrosse Branch) supplying red stabilized phosphorus for production.

The vendor holds no GWAC or government-wide BPA seats; all work flows through single-award indefinite-delivery contracts and delivery orders issued by PEO Ammunition or Navy Systems Command. Across the portfolio, NAICS concentration is pronounced—73 of 98 awards fall under Ammunition (except Small Arms) Manufacturing, with 36 awards coded to Fuzes and Primers (PSC), 9 to grenades, and 5 to bombs. The vendor competes under no small business set-aside category across its prime footprint, operating as a large business on firm fixed-price, full-and-open contracts.