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The KAK AR-15 Carbine Buffer and Spring Combo is a Milspec replacement. The spring is made from Chrome Silicon. If you are looking for a silent spring, I would recommend the JP Enterprises Gen 2 Silent Captured Buffer Spring System, found by using the link below:
https://www.opticsplanet.com/jp-enterprises-gen-2-silent-captured-buffer-spring-system.html?_iv_gun-model=ar-15&_iv_additional-features=standard-version
The manufacturer of the KAK AR-15 Carbine Buffer and Spring Combo does not state the overall weight. The buffer weight is a standard carbine buffer weight. But for the actual overall weight I recommend contacting KAK Industry.
The Chrome Silica spring is not made of plastic. This is a common spring for buffers in the AR platform. Owing to its high tensile strength and resilience to high temperatures, chrome silicon is the first choice of material when it comes to fabricating springs. Chrome Silicon springs are cold drawn and heat treated before fabricating. These springs are widely used for shock loads and/or moderately elevated temperatures.
That would depend on the caliber of the pistol and the barrel length. If you have a longer, 5.56 version, it would work, but not optimal. If you have a short barrel 9mm, no.
Yes, it will.
The weight is roughly 3.8oz.
Yes, it will.