Correct sir. I found an old thread on ARFcom confirming much the same. It had posts from old vets who used them, a guy who actually worked where they were assembled, etc.
I'll refrain from posting it here at this time because it's old, and some 1800 posts by now, but it was a wealth of information.
Mr. Paul Miller, the SPR project manager, discovered an opportunity to pick through over 15,000 M16A1s that had been sent to Crane for destruction. Realizing that these M16A1 rifles, some of which were virtually new, could be used as "free lumber” to build full SPR weapons, Paul selected several thousand rifles to be set aside for the new SPR project. The SPR underwent a minor but significant name change, with the R having originally stood for "Receiver” now standing for "Rifle".
Early Mk12 uppers at least, retroactively called "Mod 0s" did come from Armalite, Diemaco (at that time a separate company from Colt), and Colt, and were built on "New Old Stock" lowers, some still old "GM Hydramtic Division" marked! Later uppers were only sourced from Colt or Diemaco.
(The GM Hydramatic Serial # range started at 3,000,000, and consisted of two contracts. One starting in February 1969, the same time as the H&R contract, which was for 240,000 as well; each unit priced individually at $151.54 each. The second contract was for 229,217, at a per each price of $99.74, and completed delivery in June 1971.)
The rifle concept itself is dated now, largely configured using parts available from 1998-2004, and in some small ways slightly inferior to parts/specs that are shelf available purchases now.
There were several revisions, including the SPR/Mod 0, Mod 1, SPR A and B, and the Mod H. Small variations from "run" to "run" do occur as the government was using up existing stock, etc., as in the above example with Mr. Miller, and issues were worked out with suppliers such as revisions to PRI's forearm, or parts identified as "no-go" and dropped entirely, such as KAC's 2-Stage Full Auto Match Trigger being replaced by the Geissele SSF.
AS far as the Mod Holland goes, it itself was already a small-batch configuration of a small run rifle, but much the same as other SPRs, as soon as they were issued to 5th SFG units, some Ace SOCOM stocks were replaced with Magpul ACS and CTR stocks. Optics are basically anything existing in the unit's inventory, from S&B ShortDots still in the system, the 3-9x and 3.5-10x Leupold scopes from earlier Mod0s, and there’s even a photo of an ELCAN on a Mod1 floating around.
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