I recently picked up a minty Bushmaster A2 HABR rifle from a member here that didnt have many details on the rifle. I have emailed Bushmaster and they said they cant help me since it was built at their old facility and they had to turn all the records over to the ATF when they relocated. 
Bushmaster Serial Lookup
Dec 23, 2017 - Nearly Complete list of PreBan/Post Ban serial numbers timeline The Bullet ~ Handguns, Rifles and Shotguns. Join Date: Feb 2008. Jan 20, 2014 Spent some time last week with Bushmaster trying to find the original date of manufacture. No luck, records don't go back that far (LOL). Lady I spoke with told me any serial number L051000 or lower was an assembled Pre-Ban Rifle.
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Book Description Professional thief Jim Rawlings breaks into the apartment of a senior civil servant, and unintentionally discovers stolen top secret documents. In Moscow, British defector Kim Philby drafts a memorandum for the Soviet General Secretary stating that, if the Labour Party wins the next general election in the United Kingdom (scheduled for sometime in the subsequent eighteen months), the 'hard left' of the party will oust the moderate populist Neil Kinnock in favour of a radical new leader who will adopt a true Marxist-Leninist manifesto, including the expulsion of all American forces from the United Kingdom and the country's withdrawal from and repudiation of NATO. In conjunction with a GRU general, an academic named Krilov, and a master strategist, Philby devises 'Plan Aurora' to ensure a Labour victory by exploiting the party's support for unilateral disarmament - although it is noted that the strategist, a nuclear physicist and chess Grand Master, has come up with most of the plan's strategy. Although one of the most notorious thieves in London, he is enough of a patriot to anonymously send the documents to MI5 so that they might locate the traitor. The fourth protocol dvd.
Bushmaster
All they can say for sure is that it was built before 2001. The rifle is a model number XM15-E2S. The SN is L080XXX. The receiver is stamped 'B.F.I.