I managed to get some limited internet access, so I found some of the stuff I was looking for:
From Colt:
http://www.colt.com/ColtMilitary/Products/ColtM4Carbine.aspx
Quote: "The Colt M4 is the ONLY 5.56mm carbine in the world today that is manufactured to meet or exceed the stringent performance specifications (MILSPEC) required for acceptance and use by the U.S. Armed Forces."
Also this:
http://www.defenseindustrydaily.com/Colt-M4-Data-Rights-The-Individual-Carbine-Competition-06942/
Quote: "Contrary to popular misconception, the US Department of Defense does not own the technical data package (TDP) for either the M4 carbine or its parent, the M16 rifle. In June/67, in its role as the DOD’s designated procurement agency, the US Army purchased a license from Colt for the TDP and the rights to produce the M16 family of weapons and its component parts.
Some wonder why Colt proprietary rights to the M16 TDP and M4 TDP are still given such reverence by the Army, long after most applicable patents had expired. For example, the Army paid royalties on second-sourced M16 rifles and parts until 1990. It is more glaring in the case of the M4 as very little of the M4’s original design was ever patented by Colt. The short answer is that the Army agreed to such terms in the original 1967 licensing agreement and its amendments, particularly the infamous “M4 Addendum” of 1997.
The origin of the “M4 Addendum” traces back to the improper release of the M4 TDP by the US Army’s Rock Island Arsenal to the US Navy’s NSWC-Crane in early 1996. NSWC-Crane had requested a copy of the M4A1 TDP to support the solicitation of accessories for the M4 SOPMOD kit. While soliciting an adaptor for training ammunition, NSWC-Crane provided the M4A1 TDP to 21 vendors in August/96. As one of the potential bidders, Colt was very much surprised to receive a copy of their own TDP drawings, and gave notice that the terms of the 1967 Licensing Agreement had breached. NSWC-Crane quickly attempted to recover all copies of the TDP and sent out non-disclosure agreements (NDA) to the other 20 vendors. All of the vendors except FN Manufacturing complied. FN Manufacturing officials had balked on one of the five terms of the NDA, refusing to state whether they had safeguarded the TDP while it was in their possession. Instead, they provided a letter asserting that they had not improperly used the data.
Around the time, the Army announced the procurement of 716 M4A1 and 9,785 M4 carbines. FN Manufacturing submitted an unsolicited bid, which was promptly rejected. However, the damage was done. Connecticut’s Congressional delegation became involved, demanding a DOD Inspector General audit of the Army and Navy’s actions in their handling of the M4 TDP. By the end of the year, Colt announced that the DOD’s failure to adequately to protect the proprietary data constituted a material breach of the 1967 Licensing Agreement. Thus, the licensing agreement would be terminated, and the DOD could no longer use the TDP in the second-source procurement of the M16/M4 or their parts. Colt also threatened a lawsuit, estimating damages from $43.5 – 70 million. In response, the Army claimed that the license could only be terminated if they had not made a best faith effort to correct the situation.
Settlement negotiations between Colt and the Army dragged on through 1997. In December 1997, an agreement was reached. Colt would waive its damage claims and leave the previous terms of the 1967 licensing agreement intact with regards to the M16 TDP. In return, the Army agreed to not use the M4 TDP for competitive procurement for a set period of time, ensuring Colt’s sole-source status. The resulting agreement was dubbed the “M4 Addendum”.
However, FN Manufacturing still hoped to gain a piece of M4 procurement, and found their chance in May/98. The Army announced that it was awarding Colt a $8,296,925 contract for 15,925 M4/M4A1 Carbines. The following day, FN Manufacturing delivered an unsolicited proposal claiming that they were also capable of producing the M4 for the US Army. The Army’s rejection of the proposal led to FN Manufacturing filing suit in the US Court of Federal Claims.
A series of dismissals and appeals ultimately led to FN Manufacturing challenging the Army’s right to give Colt sole-source rights to the M4, given its similarity to the M16. This placed the Army is the awkward position of claiming that the M4 was really far different than the M16 and XM177, after originally claiming that the M4 had about 80% in common with the M16. The US Court of Federal Claims ultimately dismissed FN Manufacturing’s protests, ruling that the Army was well within its rights to forego any claims to the M4 TDP."
And this:
http://vuurwapenblog.com/2010/09/27/what-is-the-tdp/
Quote: "MIL-C-70559 is the military specification for the M4, which incorporates Colt’s technical data package (“TDP”). The M4 TDP consists of a series of prints and geometries (dimensions), a system of know-how, operation sheets, quality inspection methods and access to the master list of specifications and standards that comply with the requirements in Colt’s contract with the U.S. military. The TDP outlines the manufacturing process, materials, tolerances, assembly, finishes, proof testing and dimensions needed to manufacture the weapon. The military specifications (“milspecs”) and military standards (“milstds”) into which Colt’s TDP has been incorporated consist of more than two hundred extremely rigorous standards covering inspection, tolerances, targeting, endurance and interchangeability of parts.
Quality-assurance and conformance with milspecs and milstds are maintained by an onsite U.S. government inspector who keeps an office at Colt’s factory and by a number of Colt’s own inspectors. In the last two years, Colt has fired more than 300,000 rounds of ammunition in testing the carbine and has not experienced a single malfunction.
The M4-carbine TDP is proprietary to Colt, and the U.S. government has designated Colt its “sole source” supplier of M4 carbines. Under the M4 Addendum, the U.S. government does not have the right to procure the M4 carbine on a competitive basis.
Under the M4 Addendum, only Colt can manufacture M4 carbines, except in very limited circumstances and subject to a royalty payment to Colt. The M4 Addendum allows other qualified vendors to supply non-critical parts for the M4 carbine, but only if they are using Colt’s TDP. Critical items include the upper and lower receivers, the hand guard, barrels and other components of the M4 carbine.
In 1999 FN Manufacturing, Inc. (“FNMI”), a small-arms manufacturer that supplies M16 rifles to the U.S. government, challenged the government’s decision to proceed with a sole-source procurement of M4 carbines from Colt. On August 9, 1999 the U.S. Court of Federal Claims upheld the legality of the M4 Addendum, and FNMI’s challenge was dismissed."
As regards Dietz's comments from M4C, this is what I managed to pull up:
http://www.m4carbine.net/showthread.php?t=83951
Of course, what I wrote earlier was based on my (somewhat faulty these days) memory of the above and a few other articles. I think my comments, although somewhat broad, are generally backed by what I quoted above.
Regards.
Mark