Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
My Bushmaster 11.5 runs like a champ.
Per W.Larson/Semper Paratus Arms armorer course: the Industry Norm for 11.5" barrels is .076.
BCM 11.5" barrels have a gas port size of .076 (confirmed at W.Larson/Semper Paratus Arms armorer course on two of my 11.5" BCM uppers with a pin gauge).
A friend/co-workers Colt 6933 (complete Colt 6933 URG purchased from G&R in late 2016 - sent to Iraqgunz for rail install and gas port measured at .074)
Colt 14.5"/16" (M4/6920) barrels gas ports are .062.
See post #32
https://www.m4carbine.net/showthread...-quality/page4
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