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On the real rifle, it acts as a lock washer.
On the airsoft, it usually is a loose fit over the threads and spring loaded, to simulate the same thing and keep the look.
If you have the set screw under your hider, you don't need it. It's basically there for looks.
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Quote:
Originally Posted by Drake
Damnit, don't make me add "no discussing temporal paradoxes" to the rules or I'll go back in time and ban you last week.
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