I have been carrying my G21 around 1 year now in a Serpa 2 holster. I know slide wear is a fact of life but mine seems to be suffering quite a bit by now http://i.imgur.com/6PgcF.jpg I try to take very good care of it, clean it monthly or after every use at the range. When not being carried it lives in it's holster which either then sits on a towel on my night stand or on a towel on a table beside me. Is this normal? Is this a problem? Should I contact Glock?