The suspect also bought an AR-15 semiautomatic rifle, a military-style gun popular with sportsmen.
Authorities have said an AR-15 rifle was used in the Sandy Hook attack.
Police recovered two handguns and 15 rifles at Grumberg's Saugerties residence including an AR-15 semiautomatic rifle after executing a search warrant.
Despite the set-backs, it released a video this month demonstrating an AR-15 with a 3D printed part firing more than 600 rounds.
Wal-Mart, the largest munitions seller in the U.S., removed some ads to to the type of weapon (an AR-15) used at Sandy Hook.
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"An AR-15 (is) easier to shoot than a shotgun, there's less recoil in a .223 than a 12 gauge, " wrote one online user.
In one such test Dr Axtell and Dr Epstein have collaborated with George Gumerman, an ar chaeologist from the Santa Fe Institute in New Mexico, to model the Anasazi society.
As you'll see in the video below, we were shown an AR game that takes the environment around you -- walls, furniture and other elements -- and uses them as restrictions, just as much as they would be in real life.
He then used the Unity graphics rendering engine - commonly used by independent video games developers - and Vuforia - an AR app development platform made by the chip maker Qualcomm - to allow a smartphone to interact with his creation.
BBC: DIY Tardis looks bigger on inside with augmented reality
Lisa Murphy, a product marketing manager at AR firm metaio, contends that its work with Time Out New York Kids is in fact an example of AR.
Two years after each AR, the IPCC produces an updating Interim Report.
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But the emergence of its younger, more attractive cousin -- augmented reality (AR) -- in an age when computers are all-pervasive and understanding of them is widespread, means that we might, at long last, be ready to take the plunge.
By utilizing the Blender 3D creation suite (which was a first for Kumparak), Unity 3D engine and Qualcomm's Vuforia AR SDK, the result is an Android app that renders the 3D interior atop the random wave-like pattern -- visible once the door's removed -- on the TARDIS in real time (no pun intended).
ENGADGET: Mini TARDIS really is bigger on the inside, thanks to augmented reality (video)
Architectural, engineering and related services (NAICS code 5413) companies have also seen a notable increase in AR days, with collections stretched to an average 73 days from 60 last year.
Their AR days have increased slightly in 2010 and 2011, to an average of nearly nine weeks, according to the analysis of private companies by Sageworks.
The figures were obtained in an FoI request by BBC Wales' Welsh-language news website, Newyddion Ar-lein.
The idea behind AR is to connect the physical landscape, in which someone is standing, with an online equivalent.
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