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AR15.COM
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7/31/2012 7:04:18 AM EDT
I asked this over in the SBR forum, but thought there might be  some knowledge here too...

I picked up a Mega Monolithic Tubular upper and am trying to decide what to build... I am still debating between a 300 blackout or 5.56...

The options for 300 are 8.5", 9" or 9.5", and for 5.56 10.3 and 10.5... I want as little barrel extending beyond the handguard as possible... which is the shortest in both calibers that can still take a Surefire MB and can? anyone have pics of any of the mentioned combos?
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