Last edited by masakari; 12-04-17 at 20:55.
Owner/Instructor at Semper Paratus Arms
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
Of the two 6520 uppers I have (bought used from hk specialists) they have the m-4 cuts and are black, one has no markings above the gas tube hole and the other has the number 4 above the hole. They supposedly came from the DOJ and I don't know if they were refinished or not.
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
Well for the hell of it, I checked my 6520, 1999 mfg, apparently a former LE gun. I don't have a "4" about the gas tube hole and my feed ramps appear to have been cut post-anodizing although it's somewhat hard to tell because they are dirty at the moment.
A batch of 6520 uppers I have are all machined and finished, some Colt Defense and some Colt Canada. One that's handy has a 4 on it. None had sear blocks, nor would I expect them.
2012 National Zumba Endurance Champion
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Last edited by scottryan; 12-06-17 at 20:46.
"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
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