The other night I took my collapsible stock off, and when I put it back together, I didn't thread the stock in far enough to hold the buffer retainer and spring in, OOPS. Long story short It came out after I had reassembled the upper and lower, and when I took it back apart the bottom 1/16" of the spring is slighty tweaked. I put it back together correctly and it seems to be ok, i.e. no binding etc, but is this safe, or should I go ahead and replace it? If I need to replace it, any suggestions on where to get one? Thanks in advance.