Stick with the 9mm. Check out CMMG, then Rock River and don't deviate from an AR platform. It'll mostly be for plinking anyway so why not get the cheapest one to feed with the longest track record for reliability/quality, and availability of magazines/accessories? If you go with the CMMG you can get just the upper and use it on your M4gery lower with a magazine adapter and a buffer. Saves even more money. But that's just my .02, YMMV. 
(When I said plinking - that's what I meant. 16" has better ballistics for the pistol cartrige but there's a reason real shooters use 5.56 for their long(er) guns. Personally, I'd stick with a standard 5.56 and get a dedicated .22 LR upper to train with. All the guys in my office agree - they can't quit drooling over mine and after our range session several have already spent money to get their own.)
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A nation can survive its fools, and even the ambitious. But it cannot survive treason from within. An enemy at the gates is less formidable, for he is known and carries his banner openly. But the traitor moves amongst those within the gate freely, his sly whispers rustling through all the alleys, heard in the very halls of government itself. For the traitor appears not a traitor; he speaks in accents familiar to his victims, and he wears their face and their arguments, he appeals to the baseness that lies deep in the hearts of all men. He rots the soul of a nation, he works secretly and unknown in the night to undermine the pillars of the city, he infects the body politic so that it can no longer resist. A murderer is less to fear.
~ Marcus Tullius Cicero (42B.C)
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