M4A1 Lower Marking Receiver

What the government is buying

Department of the Army (W6QK ACC- Dta) has posted a solicitation notice on SAM.gov for M4A1 Lower Marking Receiver under solicitation number W912CH26QA041. Responses are due October 9, 2026, 5:00 PM EDT. The notice lists a set-aside of Total Small Business.

From the notice: 1. Request for Proposal (RFP) W56HZV-26-Q-A041 is a total small business set-aside and will result in a 5-year, Firm-Fixed Price (FFP), single-award Indefinite Delivery, Indefinite Quantity (IDIQ) contract for the supply identified below. Delivery Orders (DOs) will be placed as requirements arise. NOUN: M4A1 Lower Marking Receiver NSN: 1005-01-581-7049 PART NO.: 12972652 UNIT OF ISSUE: Each (EA) FIRST ARTICLE TESTING (FAT): Required 2. The resulting contract will consist of five Ordering Years, as further detailed in Section B of the solicitation. MINIMUM 5-YEAR QUANTITY: 726 EA MAXIMUM 5-YEAR QUANTITY: 21,638 EA NOTE: Only the minimum 5-year quantity is guaranteed. 3. There is a Technical Data Package (TDP) associated with this ...

This page summarizes the public notice only. The complete solicitation, amendments, and attachments are posted on SAM.gov, and offerors should price from the full package.

How Wexmar would machine this

Based on the notice title and classification, Wexmar would plan this work around 3- and 4-axis horizontal milling on Mazak HMCs with pallet changers, which lets several faces be machined in one clamping and holds feature-to-feature position. Every lot is inspected against the drawing on Brown & Sharpe CMMs. The notice references first article requirements, and Wexmar prepares first article inspection reports with full dimensional results for approval before production.

Equipment on the floor

• Turning: 10 Mazak and Doosan CNC lathes with live tooling
• Horizontal milling: 6 Mazak horizontal machining centers, 3- and 4-axis, with pallet changers
• Swiss: 4 Maier Swiss-type lathes, bar capacity to 32 mm
• Grinding: centerless and surface grinding
• Inspection: 2 Brown & Sharpe coordinate measuring machines

Materials

Material is set by the drawing. Wexmar machines carbon and alloy steels, stainless steels including precipitation-hardening grades, Inconel, Monel, Hastelloy, aluminum, brass, bronze, titanium, and engineering plastics, and buys bar and plate with mill certifications. Where DFARS 252.225-7009 applies, specialty metals are sourced from qualifying melt sources and the certifications travel with the parts.

Finishing and heat treatment

If the drawing calls for plating, anodizing, passivation, or heat treatment, Wexmar manages those steps through qualified outside processors and includes their certifications in the lot paperwork.

Documentation and registration

• First article inspection reports and CMM dimensional reports
• Material certifications traceable to heat lot, and certificates of conformance
• DFARS 252.225-7009 specialty metals sourcing
• ISO 9001-aligned quality system
• SAM.gov active, CAGE 16AD7, small business, woman-owned small business (WOSB)

Working with a prime or distributor

If your company is responding to W912CH26QA041, Wexmar can price the machined content against the drawing revision and quantities in the notice, quote first article and production lots as separate lines when the notice separates them, and ship to you or directly to the government destination.

Send us the files

We can build this. Send us the files. Primes, integrators, and buyers: send the drawing package and quantity and Wexmar will quote it as your subcontractor or direct supplier. Upload a PDF or STEP for an instant estimate, email ron@backwell.com, or call (315) 400-2654.

Related: Build-to-print machining, Government and defense machining, DFARS specialty metals sourcing, Defense and DoD machining.