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Good find on the 550, I've been looking for one since I bought my 551 8 years ago, I had rear stock creak on mine too(modded an m-4 stock onto it-no more creak) with the fore grip creak I mounted a couple of rails for accessories, and the creak went away, I found the creak is mostly from the two halves rubbing together, silicone spray worked also but you half to keep applying it often. Don't know if that helps any but that's what I found to work.
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