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Old June 14, 2013, 02:47 PM   #63
Senior Member
Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,996
I see the advantages of Direct gas impingement as:

Lower cost, lower weight, standard parts available from multiple sources, simple, proven design that works well in many applications and with standard carbine and rifle length barrels

Piston designs, as has been pointed out earlier, may be better suited for certain tasks and AR designs but they aren't superior for the vast majority of AR applications.
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