Variant M4 Barrel Characterization
Final rept. 2007-2008
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
Pagination or Media Count:
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.
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