The assault rifle used in mass shooter Shane Tamura’s deadly rampage at a NYC skyscraper was assembled piece by piece – with the critical part purchased by his boss, according to officials and sour…{ai:summary}<p>It appears there is no content provided for summarization. Please provide the text or information you would like summarized.</p>

NYC shooter Shane Tamura built AR-15 used in deadly rampage piece-by-piece — and his boss supplied a key part: sources

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