Check this out. This gun looks very alike to the Battle Rifle on H2. Its made by a leading weapons manufactuer called bushmaster. My pops currently owns an AR-15 made by them, but its nothing in comparison to this thing.
[url]http://www.bushmaster.com/shopping/m17s/ [/url]
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just to let you know, many weapons are based off REAL weapons, with the exception of sci-fi guns.