REQUEST FOR INFORMATION (RFI)/SOURCES SOUGHT – HEADSPACE GUAGES

Form / Attachment / Pricing Sheet

This document provides detailed specifications for headspace gauges used for various rifle calibers. It outlines the required dimensions, material, heat treatment, geometric tolerances, and surface finish for these gauges.

• Calibers Covered: 6.5 Creedmoor, 7.62 x 39, 7.62x51 (NATO), 300 AAC Blackout, 300 Norma Magnum, 300 Winchester Magnum, 338 Norma Magnum, 5.56mm (NATO, ARMY), and 277 Fury.
• Headspace Dimensions: Specifies "Go" (Minimum) and "No-Go" (Maximum) headspace dimensions with associated tolerances, referencing SAAMI or NATO standards.
• Diameter Requirements: Gauges must conform to SAAMI or NATO diameter specifications.
• Material and Hardness: High-alloy tool steel (AISI O1 or O2), heat-treated to Rockwell Hardness of 58-60 HRC.
• Geometric Tolerances: Perpendicularity requirement of 0.0002" TIR for critical surfaces.
• Surface Finish: Bearing surfaces require a finish of 16 microinches Ra or better; other surfaces require 32 microinches Ra or better.
• Labeling: Specific information required on each gauge, including "SAAMI MINIMUM (GO)" or "NATO MINIMUM (GO)", "SAAMI MAXIMUM (NO-GO)" or "NATO MAXIMUM (NO-GO)", nominal headspace dimension, caliber, and manufacturer's identification.
• Certification and Calibration: Requires third-party certification/calibration for critical dimensions, including specific data points for the report (e.g., gauge ID, date, lab name, measurement data, conformity statement).
• CAD Drawings: Vendor must provide complete CAD drawings with all critical dimensions, tolerances, material, heat treatment, surface finish, datum surfaces, and revision level.
• Packaging and Storage: Individual packaging in a labeled, durable storage container is required, with specific container and labeling requirements.

This document is critical for any bidder proposing to manufacture or supply headspace gauges. It defines all technical specifications, quality control requirements, and deliverable documentation (certification, calibration reports, CAD drawings) that must be met. Bidders must ensure their proposed product and processes align precisely with these detailed specifications to be compliant.

Form / Attachment / Pricing Sheet

This document contains technical drawings and specifications for shoulder-breeching centerfire rifle headspace gauges. It provides detailed dimensional information and material requirements for manufacturing these gauges.

• Figure I: Shoulder-Breeching Centerfire Rifle Headspace Gauges: Details the geometry and critical dimensions (labeled A through M) for various rifle cartridges.
• Table: Lists specific cartridges (e.g., 6.5 Creedmoor, 7.62x51 NATO, 5.56mm NATO) and their corresponding 'GO-MINIMUM' and 'NO-GO MAXIMUM' headspace gauge dimensions in inches.
• Figure II: Belt-Breeching Centerfire Rifle Headspace Gauges: Similar to Figure I, but for belt-breeching cartridges.
• Drawings (Pages 2 and 5): Provide detailed manufacturing blueprints for specific gauges, including tolerances, material specifications (High-Speed Tool Steel or Alloy Tool Steel, hardness Rc 60-64), surface finish requirements, and notes on calibration and marking.
• Notes: Include material, hardness, surface finish, and tolerance specifications, as well as instructions for gauge record cards and labeling.

This document is critical for any bidder involved in the manufacturing or procurement of headspace gauges for the specified rifle cartridges. It defines the precise specifications, dimensions, and quality requirements that must be met. Bidders must ensure their manufacturing processes and quality control align with these detailed technical drawings and specifications to be considered compliant.