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Old November 13, 2012, 01:13 AM   #5
chris in va
Senior Member
Join Date: December 26, 2004
Location: Louisville KY
Posts: 13,534
The whole idea with the AR platform is modularity. Just find the upper of your liking and fit it to the lower. Keep in mind piston uppers are generally heavier than the DI counterparts, and reliability is pretty much a wash. They do run cleaner though. It'll save you a few hundred bucks over buying a separate rifle.
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