AR Technical question re: Barrel length

sparrow

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I need to get my Stag M4 on my Form 6 NIA. Does anyone know how long of a spacer I need in order to install and silver solder my KAC M4 QD Flash hider onto a 14.5" barrel? . The KAC won't work as is, but it is almost there I can't imagine much of a shim is needed...anyone done this?.
 
Okay, never mind...I found the answer on silencer talk...they have pics and measurements.

http://www. calguns.net/calgunforum/showthread.php?t=73447&page=4

http://www. silencertests.com/forum/viewtopic.php?t=44478&sid=624f97565626f412332c6d10d87306e1
 
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