Fabrication and Tests of M240 Machine Gun Barrels Lined with Stellite 25

Report No. ARL-TR-7662
Authors: William S de Rosset; Sean Fudger
Date/Pages: April 2016; 32 pages
Abstract: Two M240B barrel blanks were processed with the Gun Liner Emplacement with an Elastomeric Material procedure. The liner material was Stellite 25, a cobalt-chromium alloy. The liners were made by the flow-form process. The lined blanks were sent to FN Manufacturing, Columbia, South Carolina, for hammer-forging and final machining. Firing tests of the 2 barrels were successful, with no liner movement observed. Firing tests at high rates of fire need to be conducted to determine both wear and integrity of the liner.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2016