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Old July 1st, 2010, 00:13   #4
ybrik's Avatar
Join Date: Jun 2007
Location: Ontario, Canada
If you want a retractable stock m4 with a rear-wired config, crane-stock would be good and a lipoly battery in a buffer tube.
I would prefer Lipo in a buffer tube as the wires would not be stressed from moving if it is on the crane stock.

5.56x45mm + m27 = M249(SAW)
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