From the Lightning Link page:
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Please understand that it is illegal for a US Citizen to build one of these units without special licenses and the purpose of this page is to discuss how the Lightning Link works and not to provide guidance on how to build one.
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Ed, both of the pages that I linked to contain specific language regarding the legality or illegallity of various types of auto-sears... All National Firearms Act of 1934 (NFA) rules apply... the same rules that apply to using stocks with Lugers other than the models specifically exempted from NFA controls...
Consider my chain yanked... but not very hard 
From the DIAS page
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CONCLUSIONS
If you are considering buying an auto sear to convert your AR15 to a full automatic firearm, there is only one option - the registered & transferable DIAS. While it may be tempting to buy a pre-81 to save thousands over the registered sear, the risks are considerable. Possession of an unregistered machinegun (a pre-81 DIAS and an AR15 rifle...or possibly even just a so called â??pre-81â? DIAS) is a felony punishable by up to 10 years in prison, and up to a $10,000 fine, and permanent loss of your right to ever own a gun or vote again. Numerous rumors have circulated that some of the people selling the pre-81 sears are actually BATF operations. Buyer beware.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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