Changing the inner barrel
You need to take the inner barrel/hopup unit out of the outer barrel first. It comes out as one whole unit.
That's what You said,,, it's not coming out , as there is a "kinda small shoulder" THAT THAT DOESN'T LET THE HOPUP UNT TO TAKE IT OUT... ? Taking out the 2 small screws don't make any change, only I can see that they let the "hop-up_ be taket off the barrel.. but still, I cannot get the barrel out, as that small shoulderon the barrel itself doesn't let it out...
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