http://www.americanmachinist.com/304/Issue/Article/False/8041/Issue
Beyond most of our familiarity - how Colt machines barrels, etc by exactly what machine and process. They do not hammer forge barrels. They do work hard at cutting costs, which is the primary way you can keep bidding a contract and winning it.
Since Colt is interested in making parts as cheaply as possible and still meeting quality guidelines imposed by the government to prevent cheating the taxpayer, I'm not convinced that adhering to mispec is all that noble. And just because they designed a technical data package, isn't it a list of just exactly what materials and machine operations they so diligently pursue to reduce costs and maintain a minimum level of performance?
Those terms - milspec, and TDP, are not the Good Housekeeping Seal of Approval. More like the GAO's continuing certification nobody's getting cheated. If there is anything about military contracts, graft, corruption, and outright thievery has the bulk of the history, from pocketing BIA funds that should have fed starving Indians, to the Truman Commission exposing military acquisitions in WWII. Read about the millions of your dollars thrown away in Iraq? Responsible people in jail awaiting trial?
Colt doesn't do this for free. They are in it for the money. Perspectives are reversed if Colt is making the gold standard highest quality firearm ever. Perhaps turning the viewscope around the other way will help. There are no perfect firearms, and government spec versions are usually minimum standard - not the best.
Colt doesn't hammer forge barrels. Maybe they know they aren't in it for the long run - or the shareholders dividend is more important.