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This is only my humble oppinion. But I had purchased Guarder(m120 spring) ftk kits for my tm m4 and ak47. They were both installed by a reputable gun tech.
I used both guns afterwards only to have them go down in 2 or 3 games. It seemed to be piston and gear probs in both guns. So I guess this is my caveate emptor on guarder internals. Personally I am going to stay away from guarder internals in the future.
Crash
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