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The Angry Gun kit has a much heavier buffer: 205 grams compared to the stock 41g. I think it also has a much stiffer recoil spring. It is said to increase wear on internal parts and I don't doubt that; 200 grams is heavier than many real steel buffers.
I use a 5KU buffer (57g) in one M4 and a TSC (69g) in my CQB gun, both with the stock recoil spring. If there's any increase in wear I'd say it's negligible, and it may even decrease it as there's more inertia and you can feel a slightly heavier "bump" but it's not as sharp as with the stock buffer.
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