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Eric Lamberson wrote: The main plus for the AR pistol is that it is light and compact yet provides the power and range of a rifle..

Not quite sure about this one. There is a big loss of velocity & stability between a 14 1/2" M4 & a 10 1/2" version (or 16" civilian model). So much so that you'll see your rounds hitting the dirt when attempting to reach out to 'rifle ranges' with the 10 1/2" version. Others have already posted ways to make it more reliable, but in the end temper expectations when shooting a rifle round through a really short barrel.