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7/16/2011 9:50:28 AM EDT
Hey guys, I have a .308 DPMS AP4 and I am planning on making a dissipator style rifle out of it. by chopping the existing FSB, putting a long tube on it and bolting on a FSB as far forward as I can get it.  I mic'd the BBL just aft of the FH and it is .720.  Short of wrapping a bunch of tape how do I get a FSB to fit here?  I spent all morning surfing Brownells but everything is .750..  HELP?

Oh, and in case it isn't obvious, I am leaving the gas system alone, and am looking for a bolt on FSB, not pinned.  Also this FSB has to be strong enough to survive being tossed in a barrel..
7/16/2011 10:24:09 AM EDT
[#1]
You will probably have to get a .625 FSB and have it reamed out to the diameter you need.
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