#1
I recently bought a new Gibson SG Standard from a local shop. The guitar sounds great but when I am on the bridge pickup it will cause bad high pitched feedback unless I use my fingers to stop the strings. I know that that's not really hard to do to stop the feedback but I was wondering if that's normal or not. If the strings are untouched it causes the feedback horribly.
#2
take it back and have them fix the grounding issue your having. They will probably (and should) do it for free
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#4
How loud is your amp, and how close are you standing to it? This could just be normal if you have a really high output pickup in the bridge.

Other than that, it's probably just a loose ground somewhere, which is a 30 second job to fix if you have a solder iron.
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