[Solved] Help! Can't unscrew flash suppressor's nut set screw

[chopper 1]

odball allen screw

Tried all the tools I have, still couldn't get rid of the flash suppressor's round nut set screw. Here's the pic for my gun and tools. Can you take a look, do I just miss the right screw?

Tools:

flooded it with kroil for a couple of days - heated it with a butane lighter - burned off all the oil - oiled it again - a day later used a key that was close - with a t - shirt around it - the screw slipped right out

 

[millwright]

Another good way to remove set screws is buy the smallest square ez out you can find and pound it in place just make sure you support what ever it is your hitting. The hammering may help loosen it and the square ends cut their way in.I don't like to use the spiral ez outs because for me they tend to either not work worth a poop or they wedge themselves in the hole and cause the threads to be tighter.