IIRC you only lose 150-200fps between 16 & 20" barrels with most ammo, probably more important is what role you're going to use it in most. 18" barrels don't seem to be very common.
1:7-1:9 will work with most weights, though if you'll be shooting light (40-45gr) varmint bullets you'll...
That's everything you'll need. The complete lower should already have a front pin, you won't need a conversion pin for an M16A1 upper but would for certain years of Colt 'civilian' uppers.
ar15.com (active in team, GD & HTF forums, but read more than I can tell in the tech forums)
glocktalk.com (read & occasionally post)
thehighroad.org (mostly to read)
I like the "international community" here, it's good to hear from our friends across the oceans.
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