04-28-2013, 01:17 AM
Thanks for the good data Shivesy- I'm sure someone will broadcast their thoughts on this. I have a co-worker that bought 2 rifle uppers recently , and is having the same port diam. issue-I thought that this was the problem= he doesn't know that yet-he is lost on this. One runs fine-yet the same as the other won't run . Same parts-same same all around. One for the hubby-& 1 for the wife deal here. I will set him on this course -of diam. inspections. Thanks shiv.!