i had trouble with with new korean 30 round mag jaming. later on begin to have jams with 15 rd mags .i have a tight gas pistion so i was going to clean and replace it to make sure the gun was not short strokeing.the nut would not move.i saw no stake marks,so i called the guy who had owned the carbine he had put it on with red locktite i know that means heat to remove,i don,t want to mess the barrel up ,would it be safe to us propane torch,heat with soldering iron.? most of my trouble was aquile ammo, pmc runs 100 per cent better.but it will worry the h--l out of me till i know how to get the nut of safe. alway great help here.
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