This is totally cool. ONYX Lego Beretta 9mm Series 92.
Not only this, but while looking around I found there are CAD type programs for legoes. See the link on the left at the above site. I am guessing that there are models to download all over the net. (I’ll get back to ya on that 
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So have you built the Baretta yet? I wanna go buy some legos just to see if I could do it.