155mm Modular Artillery for Combat Effectiveness (MACE)

The two versions are nearly identical in the visible text. The only difference is the attachment filename, which changed from "Dated_10_6_" to "Dated_10_15_", indicating a later attachment revision. The visible body text (executive summary, acquisition approach, phase descriptions, eligibility conditions, and due dates of September 30 and October 30, 2026) reads the same in both versions, and the excerpts are truncated before any later sections where substantive edits might appear.

No substantive change to requirements, objectives, restrictions, or technical focus is evident in the provided text. Applicants should review the full October 15 attachment directly, since the excerpt cutoff may hide edits in later sections.

Description information changed.

Amendment 0004 added to the MACE (155mm Modular Artillery for Combat Effectiveness) description:

• Q&A document replaced: Attachment 15 (Updated MACE Offeror Questions Addressed 9-17) is superseded by Attachment 16 (Updated MACE Offeror Questions Addressed 9-24). Offerors should re-read the newer version for any government clarifications issued between Sept 17 and Sept 24, and make sure proposals reflect them.
• Six more TDP documents uploaded to SAM.gov: Vendors already approved for the Technical Data Package (TDP) can access them now. Vendors not yet approved must request TDP access through SAM. Anyone who needs the technical data should start the approval process early, since the documents and the Attachment 8 and 9 packages are gated behind the signed Attachments 12, 6 and 14.

Not changed: The description does not mention a new response deadline. The last stated deadline remains October 30, 2026 (from Amendment 0001). Amendments 0001–0003 and the rest of the text are unchanged.

The open date moved from September 18, 2026 to September 24, 2026, a delay of 6 days.

Why it matters for applicants:

• The application window now begins 6 days later. If the close date was not changed (it isn't listed as changed), applicants have 6 fewer days in the window overall.
• Applicants cannot submit before September 24. Any plans built around a September 18 start, such as early submission or system testing, need to be pushed back.
• The extra lead time before opening can be used to prepare, but applicants should confirm the close date on the listing, since a fixed deadline now means a shorter submission period.

Action: Update internal timelines and calendars, and check that SAM.gov, Grants.gov, and any other registrations are active before the new open date.

New opportunity: 155mm Modular Artillery for Combat Effectiveness (MACE)