THE BASIC PRINCIPLES OF COLT COMBAT UNIT RAIL GUN 45

A lot of rifles were being rebuilt, Specifically Vietnam era rifles.  Normally the barrels ended up replaced.  Some examples of markings observed on replacment barrels incorporate:He explained the barrel is often a Faxon nitrided barrel that may be concluded to look like phosphate, but final I read was that the barrels are made by Ballistic Gain,