Jerryho2005 Member Joined: Jul 2012  CA, USA Posts: 15 Feedback: 0% (0)	Posted: 8/5/2012 9:14:49 PM THE IMAGE ABOVE IS A PAID ADVERTISEMENT Sorry I did not make it clear on my last post... Have anyone shoot 300 AAC blackout with your M4 / AR15 lower with the 300 BLK barrel as upper.
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jBoy723 NFA Stamp Collector.. Team Member Joined: Aug 2008  USA Posts: 5239 Feedback: 100% (9) Link To This Post	Posted: 8/5/2012 9:17:11 PM I have a couple of friends that own and shoot 300blk with their standard .223/5.56 lowers and haven't had any issues..
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utyankee Denied insurance... for living in the danger zone. Team Member Joined: Mar 2012  OH, USA Posts: 123 Feedback: 100% (11) Link To This Post	Posted: 8/5/2012 9:35:36 PM The only difference is a barrel change between the two. No reason for issues. I run 300, 5.56, and 5.45 just swapping uppers and mags.
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lilMAC25 Member Joined: Mar 2005  TX, USA Posts: 1736 Feedback: 100% (28) Link To This Post	Posted: 8/5/2012 9:38:04 PM Originally Posted By Jerryho2005: Sorry I did not make it clear on my last post... Have anyone shoot 300 AAC blackout with your M4 / AR15 lower with the 300 BLK barrel as upper. Yes. In fact my 9.5" 300BLK upper functions quite well on my SBR lower.
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Saddlerocker Member Joined: Sep 2011  PA, USA Posts: 771 Feedback: 0% (0) Link To This Post	Posted: 8/5/2012 10:18:44 PM literally the only difference is the barrel. Why wouldnt it work?
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Stickman Rainier Arms Industry Partner Joined: Mar 2002  USA Posts: 25771 Feedback: 100% (1) Link To This Post	Posted: 8/5/2012 10:51:11 PM Originally Posted By Jerryho2005: Sorry I did not make it clear on my last post... Have anyone shoot 300 AAC blackout with your M4 / AR15 lower with the 300 BLK barrel as upper. Yes, I do all the time. There are no problems doing this.
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alemonkey Beer drinking, gun toting, libertarian simian. Team Member Joined: Feb 2010  NE, USA Posts: 1675 Feedback: 100% (8) Link To This Post	Posted: 8/5/2012 11:12:35 PM I'll go you one further....I shoot my .300 blackout on the same lower as my .22LR upper! Whether or not they have a caliber marked on them, lowers are not caliber specific.
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thornejc Member Joined: Jun 2011  SC, USA Posts: 816 Feedback: 100% (52) Link To This Post	Posted: 8/6/2012 10:18:34 AM All 300BLK is is a necked up 556... nothing really changes except for the barrel. 300BLK brass starts life as 556 brass
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