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I considered making an entire hopup arm, but that would restrict me to only one kind of hopup, whereas nubs are basically universal. Once I figure this stuff out, I may try that, but the m4 hopup arm is quite weird, and I'm not that great at replicating real parts yet. (It's easier to just make something new). Right now, I'm constrained by the window cut into the barrel, because that is quite small, and I want this to be a drop in upgrade, so cutting the barrel isn't an option :P
And yes, I also have a thread on ASM.
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