Swapped out my 11.5" 5.56 barrel (which has now been lost by the courier on the way to another forum member, a whole other story) for Beavis' old 6.5 Grendel barrel (less than 200 rounds) and a new 15" Aero handguard. Rest of the build is Aero/Spikes/Magpul/Hiperfire.
The 20 round 5.56/.223 PMags feed better than the dedicated 6.5 Grendel mags. Go figure.
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