i am considering building a new AR carbine most likely in the m4/forgery type.
but there are so many ways of building a AR carbine--
you have the standard m4 with the 14.5 barrel ( yea i know if needs a permanent flash hider to add up to 16+inches for the law. or SBR paperwork)
the civilian m4 with the 16 inch barrel,
the 16 inch carbine with heavy barrel and regular carbine stocks.
and lastly the 16inch barrel with the mid-length gas tube and longer thiner plastic.
the question--which is the most reliable? and which is the most popular among AR folks?? or should i say--screw this and build one with a 20"???