A7_Dwgs.pdf

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REQUEST FOR INFORMATION (RFI)/SOURCES SOUGHT – HEADSPACE GUAGES
Solicitation number
N0016426SNB49
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This document is a technical specification for shoulder-breaching and belt-breaching centerfire rifle headspace gauges used in federal weapons testing and quality assurance.

The specification provides detailed measurement standards for nine cartridge types: 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. For each cartridge, the document specifies two critical gauge dimensions: the "F" (GO-MINIMUM) measurement with a tolerance of +.0002 inches and the "F" (NO-GO MAXIMUM) measurement with a tolerance of -.0002 inches. Additionally, each cartridge includes a "M" value representing the gauge radius. Figure I provides detailed technical drawings of shoulder-breaching centerfire rifle headspace gauges showing dimensional specifications, material requirements (SAE/AISI steel or equivalent), heat treatment specifications, and surface finish requirements. Figure II presents the corresponding specifications for belt-breaching centerfire rifle headspace gauges, specifically applicable to the 300 Winchester Magnum cartridge, with similar dimensional tolerances and material specifications. The technical drawings reference NATO standards and SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) specifications, indicating these gauges meet military and industry standards for precision ammunition and firearms manufacturing quality control.

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CARTRIDGE

“F” (GO- MINIMUM)) +.0002

(inches)

“F” (NO-GO MAXIMUM)) -.0002

(inches)

M

6.5 Creedmoor

1.541

1.551

.400

7.62 x 39

1.252

1.262

.3662

7.62x51 (NATO)*

1.6300

1.6400

300 AAC Blackout

1.0789

1.0889

.351

300 Norma Magnum

2.036

2.046

.455

300 Winchester Magnum** .220 .227 .533

338 Norma Magnum

2.0101

2.0201

.475

5.56mm (NATO, ARMY)*

1.4646

1.4730

.330

277 Fury

1.6800

1.6870

*NATO Reference drawings attached after table.

** 300 Winchester Magnum is belted see Belt-Breeching SAAMI drawing.

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