Originally Posted by
556sniper
I have one if these 6945 cut down LE trade uppers I bought secondhand. It has very minmal wear which is nice, however mine does not cycle xm193, pmc xtac, m855 reliably. I have tried buffers H, HH and H3 to no avail. It will run hotloaded Fiocchi and Norma ammo.Sadly I am thinking that this may be a gasport issue. Hopefully I can get it figured out because its a neat piece of Colt
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