Accession Number:

ADA591215

Title:

Variant M4 Barrel Characterization

Descriptive Note:

Final rept. 2007-2008

Corporate Author:

ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS

Report Date:

2009-07-01

Pagination or Media Count:

21.0

Abstract:

Four candidate barrels configurations were investigated in the as-received condition and after endurance testing. Each configuration was manufactured from one of two CrMo V steels and either button broach or hammer forge rifling. The investigation noted rough chromium bore coatings, variations in coating thickness, and cracking in the substrate steel in the as-received barrels. Loss of Cr in the forcing cone, widespread Cu deposits and damage to the rifling forward of the forcing cone was noted for all fired barrels.

Subject Categories:

  • Machinery and Tools
  • Ammunition and Explosives
  • Guns

Distribution Statement:

APPROVED FOR PUBLIC RELEASE