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The weight is supposed to shift. It serves to dampen bolt bounce and slow BCG reciprocation. Filling it with silicone will eliminate that function, and increase wear and stress on the bolt group - in other words, a bad idea.
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you're right, it was designed to fix the problem that sometimes arose during full auto firing.
in semi auto, it's nothing but a noise maker
they also make solid buffers that reduce carrier bounce in full auto
http://www.rangeroutreachcenter.com/Rifle%20Model.html
to save money and quiet down your semi auto, the silicon works great
i strongly recommend it