Get an SR 15/25 frontend and perhaps put an m16 inner barrel in it. With a bipod/scope/silencer it makes for a pretty awesome looking sniper platform. In a pinch, or with a carry handle, it makes a nice m16a4-esque assault rifle. I'm assuming this will be an outdoor gun at that velocity, so the longer barrel won't be much of a handicap.
I dont' have a classified ad listed, but there's a spare SR15 frontend kicking around my room. If you want to see what it looks like, email or PM me or something.
Good luck,
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