http://longislandfirearms.com/forum/ http://www.eblah.com en http://longislandfirearms.com/forum/m-1268373442.57839/ http://longislandfirearms.com/forum/m-1268373442.57839/#num1
If you zero your AR15 at 50-yards (with a 20-inch barrel), here's a sample ballistic chart for XM193 (55-gr FMJBT) ammo for POIs at other distances:

Yardage/POI:
25y- (-1.12")
50y- 0
75y- .84"
100y- 1.39"
150y- 1.56"
200y- .36"
250y- (-2.33")
300y- (-6.71")
350y- (-12.95")
400y- (-21.28")

I have found this data to be very accurate (at least at ranges up to 200-yards) for my Colt and Rock River ARs. The distances will change somewhat with a 16-inch carbine barrel, but will be close enough to get you on the paper or on target.
]]> Fri, 12 Mar 2010 00:57:22 phoenix27 http://longislandfirearms.com/forum/m-1268268750.6681/ http://longislandfirearms.com/forum/m-1268268750.6681/#num1    I think it's time to clean it......
Alittle out of battery firing here]]> Wed, 10 Mar 2010 19:52:30 artburg http://longislandfirearms.com/forum/m-1268200986.34999/ http://longislandfirearms.com/forum/m-1268200986.34999/#num1 Wed, 10 Mar 2010 01:03:06 possum http://longislandfirearms.com/forum/m-1268170482.40352/ http://longislandfirearms.com/forum/m-1268170482.40352/#num1
I used a spring and a buffer.

TIA]]> Tue, 9 Mar 2010 16:34:42 cam99 http://longislandfirearms.com/forum/m-1268153879.46315/ http://longislandfirearms.com/forum/m-1268153879.46315/#num1 Tue, 9 Mar 2010 11:57:59 weasertt